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1411 lines
47 KiB
1411 lines
47 KiB
/* |
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* AVI demuxer |
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* Copyright (c) 2001 Fabrice Bellard |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/mathematics.h" |
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#include "libavutil/bswap.h" |
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#include "libavutil/dict.h" |
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#include "libavutil/avstring.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "avi.h" |
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#include "dv.h" |
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#include "riff.h" |
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|
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#undef NDEBUG |
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#include <assert.h> |
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|
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typedef struct AVIStream { |
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int64_t frame_offset; /* current frame (video) or byte (audio) counter |
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(used to compute the pts) */ |
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int remaining; |
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int packet_size; |
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|
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uint32_t scale; |
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uint32_t rate; |
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int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */ |
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|
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int64_t cum_len; /* temporary storage (used during seek) */ |
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|
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int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b' |
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int prefix_count; |
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uint32_t pal[256]; |
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int has_pal; |
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int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer |
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|
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AVFormatContext *sub_ctx; |
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AVPacket sub_pkt; |
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uint8_t *sub_buffer; |
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} AVIStream; |
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|
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typedef struct { |
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int64_t riff_end; |
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int64_t movi_end; |
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int64_t fsize; |
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int64_t movi_list; |
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int64_t last_pkt_pos; |
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int index_loaded; |
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int is_odml; |
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int non_interleaved; |
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int stream_index; |
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DVDemuxContext* dv_demux; |
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int odml_depth; |
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#define MAX_ODML_DEPTH 1000 |
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} AVIContext; |
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|
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static const char avi_headers[][8] = { |
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' }, |
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' }, |
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19}, |
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{ 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' }, |
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{ 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' }, |
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{ 0 } |
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}; |
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|
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static const AVMetadataConv avi_metadata_conv[] = { |
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{ "strn", "title" }, |
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{ 0 }, |
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}; |
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|
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static int avi_load_index(AVFormatContext *s); |
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static int guess_ni_flag(AVFormatContext *s); |
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|
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#define print_tag(str, tag, size) \ |
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av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \ |
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str, tag & 0xff, \ |
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(tag >> 8) & 0xff, \ |
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(tag >> 16) & 0xff, \ |
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(tag >> 24) & 0xff, \ |
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size) |
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|
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static inline int get_duration(AVIStream *ast, int len){ |
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if(ast->sample_size){ |
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return len; |
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}else if (ast->dshow_block_align){ |
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return (len + ast->dshow_block_align - 1)/ast->dshow_block_align; |
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}else |
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return 1; |
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} |
|
|
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static int get_riff(AVFormatContext *s, AVIOContext *pb) |
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{ |
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AVIContext *avi = s->priv_data; |
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char header[8]; |
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int i; |
|
|
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/* check RIFF header */ |
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avio_read(pb, header, 4); |
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avi->riff_end = avio_rl32(pb); /* RIFF chunk size */ |
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avi->riff_end += avio_tell(pb); /* RIFF chunk end */ |
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avio_read(pb, header+4, 4); |
|
|
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for(i=0; avi_headers[i][0]; i++) |
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if(!memcmp(header, avi_headers[i], 8)) |
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break; |
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if(!avi_headers[i][0]) |
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return AVERROR_INVALIDDATA; |
|
|
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if(header[7] == 0x19) |
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av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n"); |
|
|
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return 0; |
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} |
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|
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static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){ |
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AVIContext *avi = s->priv_data; |
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AVIOContext *pb = s->pb; |
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int longs_pre_entry= avio_rl16(pb); |
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int index_sub_type = avio_r8(pb); |
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int index_type = avio_r8(pb); |
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int entries_in_use = avio_rl32(pb); |
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int chunk_id = avio_rl32(pb); |
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int64_t base = avio_rl64(pb); |
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int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0'); |
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AVStream *st; |
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AVIStream *ast; |
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int i; |
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int64_t last_pos= -1; |
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int64_t filesize= avio_size(s->pb); |
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|
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av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n", |
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longs_pre_entry,index_type, entries_in_use, chunk_id, base); |
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|
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if(stream_id >= s->nb_streams || stream_id < 0) |
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return AVERROR_INVALIDDATA; |
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st= s->streams[stream_id]; |
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ast = st->priv_data; |
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|
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if(index_sub_type) |
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return AVERROR_INVALIDDATA; |
|
|
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avio_rl32(pb); |
|
|
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if(index_type && longs_pre_entry != 2) |
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return AVERROR_INVALIDDATA; |
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if(index_type>1) |
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return AVERROR_INVALIDDATA; |
|
|
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if(filesize > 0 && base >= filesize){ |
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av_log(s, AV_LOG_ERROR, "ODML index invalid\n"); |
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if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF) |
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base &= 0xFFFFFFFF; |
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else |
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return AVERROR_INVALIDDATA; |
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} |
|
|
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for(i=0; i<entries_in_use; i++){ |
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if(index_type){ |
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int64_t pos= avio_rl32(pb) + base - 8; |
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int len = avio_rl32(pb); |
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int key= len >= 0; |
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len &= 0x7FFFFFFF; |
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|
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av_dlog(s, "pos:%"PRId64", len:%X\n", pos, len); |
|
|
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if(pb->eof_reached) |
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return AVERROR_INVALIDDATA; |
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|
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if(last_pos == pos || pos == base - 8) |
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avi->non_interleaved= 1; |
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if(last_pos != pos && (len || !ast->sample_size)) |
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av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0); |
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|
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ast->cum_len += get_duration(ast, len); |
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last_pos= pos; |
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}else{ |
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int64_t offset, pos; |
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int duration; |
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offset = avio_rl64(pb); |
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avio_rl32(pb); /* size */ |
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duration = avio_rl32(pb); |
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|
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if(pb->eof_reached) |
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return AVERROR_INVALIDDATA; |
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|
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pos = avio_tell(pb); |
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|
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if(avi->odml_depth > MAX_ODML_DEPTH){ |
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av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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|
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avio_seek(pb, offset+8, SEEK_SET); |
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avi->odml_depth++; |
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read_braindead_odml_indx(s, frame_num); |
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avi->odml_depth--; |
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frame_num += duration; |
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|
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avio_seek(pb, pos, SEEK_SET); |
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} |
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} |
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avi->index_loaded=1; |
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return 0; |
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} |
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|
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static void clean_index(AVFormatContext *s){ |
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int i; |
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int64_t j; |
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|
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for(i=0; i<s->nb_streams; i++){ |
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AVStream *st = s->streams[i]; |
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AVIStream *ast = st->priv_data; |
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int n= st->nb_index_entries; |
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int max= ast->sample_size; |
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int64_t pos, size, ts; |
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|
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if(n != 1 || ast->sample_size==0) |
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continue; |
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|
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while(max < 1024) max+=max; |
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|
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pos= st->index_entries[0].pos; |
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size= st->index_entries[0].size; |
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ts= st->index_entries[0].timestamp; |
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|
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for(j=0; j<size; j+=max){ |
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av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME); |
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} |
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} |
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} |
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|
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static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size) |
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{ |
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AVIOContext *pb = s->pb; |
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char key[5] = {0}, *value; |
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|
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size += (size & 1); |
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|
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if (size == UINT_MAX) |
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return AVERROR(EINVAL); |
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value = av_malloc(size+1); |
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if (!value) |
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return AVERROR(ENOMEM); |
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avio_read(pb, value, size); |
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value[size]=0; |
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|
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AV_WL32(key, tag); |
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|
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return av_dict_set(st ? &st->metadata : &s->metadata, key, value, |
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AV_DICT_DONT_STRDUP_VAL); |
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} |
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|
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static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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|
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static void avi_metadata_creation_time(AVDictionary **metadata, char *date) |
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{ |
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char month[4], time[9], buffer[64]; |
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int i, day, year; |
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/* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */ |
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if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d", |
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month, &day, time, &year) == 4) { |
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for (i=0; i<12; i++) |
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if (!av_strcasecmp(month, months[i])) { |
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snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s", |
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year, i+1, day, time); |
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av_dict_set(metadata, "creation_time", buffer, 0); |
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} |
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} else if (date[4] == '/' && date[7] == '/') { |
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date[4] = date[7] = '-'; |
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av_dict_set(metadata, "creation_time", date, 0); |
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} |
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} |
|
|
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static void avi_read_nikon(AVFormatContext *s, uint64_t end) |
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{ |
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while (avio_tell(s->pb) < end) { |
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uint32_t tag = avio_rl32(s->pb); |
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uint32_t size = avio_rl32(s->pb); |
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switch (tag) { |
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case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */ |
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uint64_t tag_end = avio_tell(s->pb) + size; |
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while (avio_tell(s->pb) < tag_end) { |
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uint16_t tag = avio_rl16(s->pb); |
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uint16_t size = avio_rl16(s->pb); |
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const char *name = NULL; |
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char buffer[64] = {0}; |
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size -= avio_read(s->pb, buffer, |
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FFMIN(size, sizeof(buffer)-1)); |
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switch (tag) { |
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case 0x03: name = "maker"; break; |
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case 0x04: name = "model"; break; |
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case 0x13: name = "creation_time"; |
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if (buffer[4] == ':' && buffer[7] == ':') |
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buffer[4] = buffer[7] = '-'; |
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break; |
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} |
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if (name) |
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av_dict_set(&s->metadata, name, buffer, 0); |
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avio_skip(s->pb, size); |
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} |
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break; |
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} |
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default: |
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avio_skip(s->pb, size); |
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break; |
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} |
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} |
|
} |
|
|
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static int avi_read_header(AVFormatContext *s) |
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{ |
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AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
unsigned int tag, tag1, handler; |
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int codec_type, stream_index, frame_period; |
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unsigned int size; |
|
int i; |
|
AVStream *st; |
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AVIStream *ast = NULL; |
|
int avih_width=0, avih_height=0; |
|
int amv_file_format=0; |
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uint64_t list_end = 0; |
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int ret; |
|
|
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avi->stream_index= -1; |
|
|
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ret = get_riff(s, pb); |
|
if (ret < 0) |
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return ret; |
|
|
|
avi->fsize = avio_size(pb); |
|
if(avi->fsize<=0) |
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avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end; |
|
|
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/* first list tag */ |
|
stream_index = -1; |
|
codec_type = -1; |
|
frame_period = 0; |
|
for(;;) { |
|
if (pb->eof_reached) |
|
goto fail; |
|
tag = avio_rl32(pb); |
|
size = avio_rl32(pb); |
|
|
|
print_tag("tag", tag, size); |
|
|
|
switch(tag) { |
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case MKTAG('L', 'I', 'S', 'T'): |
|
list_end = avio_tell(pb) + size; |
|
/* Ignored, except at start of video packets. */ |
|
tag1 = avio_rl32(pb); |
|
|
|
print_tag("list", tag1, 0); |
|
|
|
if (tag1 == MKTAG('m', 'o', 'v', 'i')) { |
|
avi->movi_list = avio_tell(pb) - 4; |
|
if(size) avi->movi_end = avi->movi_list + size + (size & 1); |
|
else avi->movi_end = avio_size(pb); |
|
av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end); |
|
goto end_of_header; |
|
} |
|
else if (tag1 == MKTAG('I', 'N', 'F', 'O')) |
|
ff_read_riff_info(s, size - 4); |
|
else if (tag1 == MKTAG('n', 'c', 'd', 't')) |
|
avi_read_nikon(s, list_end); |
|
|
|
break; |
|
case MKTAG('I', 'D', 'I', 'T'): { |
|
unsigned char date[64] = {0}; |
|
size += (size & 1); |
|
size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1)); |
|
avio_skip(pb, size); |
|
avi_metadata_creation_time(&s->metadata, date); |
|
break; |
|
} |
|
case MKTAG('d', 'm', 'l', 'h'): |
|
avi->is_odml = 1; |
|
avio_skip(pb, size + (size & 1)); |
|
break; |
|
case MKTAG('a', 'm', 'v', 'h'): |
|
amv_file_format=1; |
|
case MKTAG('a', 'v', 'i', 'h'): |
|
/* AVI header */ |
|
/* using frame_period is bad idea */ |
|
frame_period = avio_rl32(pb); |
|
avio_skip(pb, 4); |
|
avio_rl32(pb); |
|
avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX; |
|
|
|
avio_skip(pb, 2 * 4); |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
avih_width=avio_rl32(pb); |
|
avih_height=avio_rl32(pb); |
|
|
|
avio_skip(pb, size - 10 * 4); |
|
break; |
|
case MKTAG('s', 't', 'r', 'h'): |
|
/* stream header */ |
|
|
|
tag1 = avio_rl32(pb); |
|
handler = avio_rl32(pb); /* codec tag */ |
|
|
|
if(tag1 == MKTAG('p', 'a', 'd', 's')){ |
|
avio_skip(pb, size - 8); |
|
break; |
|
}else{ |
|
stream_index++; |
|
st = avformat_new_stream(s, NULL); |
|
if (!st) |
|
goto fail; |
|
|
|
st->id = stream_index; |
|
ast = av_mallocz(sizeof(AVIStream)); |
|
if (!ast) |
|
goto fail; |
|
st->priv_data = ast; |
|
} |
|
if(amv_file_format) |
|
tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s'); |
|
|
|
print_tag("strh", tag1, -1); |
|
|
|
if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){ |
|
int64_t dv_dur; |
|
|
|
/* |
|
* After some consideration -- I don't think we |
|
* have to support anything but DV in type1 AVIs. |
|
*/ |
|
if (s->nb_streams != 1) |
|
goto fail; |
|
|
|
if (handler != MKTAG('d', 'v', 's', 'd') && |
|
handler != MKTAG('d', 'v', 'h', 'd') && |
|
handler != MKTAG('d', 'v', 's', 'l')) |
|
goto fail; |
|
|
|
ast = s->streams[0]->priv_data; |
|
av_freep(&s->streams[0]->codec->extradata); |
|
av_freep(&s->streams[0]->codec); |
|
av_freep(&s->streams[0]); |
|
s->nb_streams = 0; |
|
if (CONFIG_DV_DEMUXER) { |
|
avi->dv_demux = avpriv_dv_init_demux(s); |
|
if (!avi->dv_demux) |
|
goto fail; |
|
} |
|
s->streams[0]->priv_data = ast; |
|
avio_skip(pb, 3 * 4); |
|
ast->scale = avio_rl32(pb); |
|
ast->rate = avio_rl32(pb); |
|
avio_skip(pb, 4); /* start time */ |
|
|
|
dv_dur = avio_rl32(pb); |
|
if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) { |
|
dv_dur *= AV_TIME_BASE; |
|
s->duration = av_rescale(dv_dur, ast->scale, ast->rate); |
|
} |
|
/* |
|
* else, leave duration alone; timing estimation in utils.c |
|
* will make a guess based on bitrate. |
|
*/ |
|
|
|
stream_index = s->nb_streams - 1; |
|
avio_skip(pb, size - 9*4); |
|
break; |
|
} |
|
|
|
assert(stream_index < s->nb_streams); |
|
st->codec->stream_codec_tag= handler; |
|
|
|
avio_rl32(pb); /* flags */ |
|
avio_rl16(pb); /* priority */ |
|
avio_rl16(pb); /* language */ |
|
avio_rl32(pb); /* initial frame */ |
|
ast->scale = avio_rl32(pb); |
|
ast->rate = avio_rl32(pb); |
|
if(!(ast->scale && ast->rate)){ |
|
av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate); |
|
if(frame_period){ |
|
ast->rate = 1000000; |
|
ast->scale = frame_period; |
|
}else{ |
|
ast->rate = 25; |
|
ast->scale = 1; |
|
} |
|
} |
|
avpriv_set_pts_info(st, 64, ast->scale, ast->rate); |
|
|
|
ast->cum_len=avio_rl32(pb); /* start */ |
|
st->nb_frames = avio_rl32(pb); |
|
|
|
st->start_time = 0; |
|
avio_rl32(pb); /* buffer size */ |
|
avio_rl32(pb); /* quality */ |
|
ast->sample_size = avio_rl32(pb); /* sample ssize */ |
|
ast->cum_len *= FFMAX(1, ast->sample_size); |
|
av_dlog(s, "%"PRIu32" %"PRIu32" %d\n", |
|
ast->rate, ast->scale, ast->sample_size); |
|
|
|
switch(tag1) { |
|
case MKTAG('v', 'i', 'd', 's'): |
|
codec_type = AVMEDIA_TYPE_VIDEO; |
|
|
|
ast->sample_size = 0; |
|
break; |
|
case MKTAG('a', 'u', 'd', 's'): |
|
codec_type = AVMEDIA_TYPE_AUDIO; |
|
break; |
|
case MKTAG('t', 'x', 't', 's'): |
|
codec_type = AVMEDIA_TYPE_SUBTITLE; |
|
break; |
|
case MKTAG('d', 'a', 't', 's'): |
|
codec_type = AVMEDIA_TYPE_DATA; |
|
break; |
|
default: |
|
av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1); |
|
goto fail; |
|
} |
|
if(ast->sample_size == 0) |
|
st->duration = st->nb_frames; |
|
ast->frame_offset= ast->cum_len; |
|
avio_skip(pb, size - 12 * 4); |
|
break; |
|
case MKTAG('s', 't', 'r', 'f'): |
|
/* stream header */ |
|
if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { |
|
avio_skip(pb, size); |
|
} else { |
|
uint64_t cur_pos = avio_tell(pb); |
|
if (cur_pos < list_end) |
|
size = FFMIN(size, list_end - cur_pos); |
|
st = s->streams[stream_index]; |
|
switch(codec_type) { |
|
case AVMEDIA_TYPE_VIDEO: |
|
if(amv_file_format){ |
|
st->codec->width=avih_width; |
|
st->codec->height=avih_height; |
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
|
st->codec->codec_id = AV_CODEC_ID_AMV; |
|
avio_skip(pb, size); |
|
break; |
|
} |
|
tag1 = ff_get_bmp_header(pb, st); |
|
|
|
if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) { |
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
|
st->codec->codec_tag = tag1; |
|
st->codec->codec_id = AV_CODEC_ID_XSUB; |
|
break; |
|
} |
|
|
|
if(size > 10*4 && size<(1<<30)){ |
|
st->codec->extradata_size= size - 10*4; |
|
st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); |
|
if (!st->codec->extradata) { |
|
st->codec->extradata_size= 0; |
|
return AVERROR(ENOMEM); |
|
} |
|
avio_read(pb, st->codec->extradata, st->codec->extradata_size); |
|
} |
|
|
|
if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly |
|
avio_r8(pb); |
|
|
|
/* Extract palette from extradata if bpp <= 8. */ |
|
/* This code assumes that extradata contains only palette. */ |
|
/* This is true for all paletted codecs implemented in Libav. */ |
|
if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) { |
|
int pal_size = (1 << st->codec->bits_per_coded_sample) << 2; |
|
const uint8_t *pal_src; |
|
|
|
pal_size = FFMIN(pal_size, st->codec->extradata_size); |
|
pal_src = st->codec->extradata + st->codec->extradata_size - pal_size; |
|
#if HAVE_BIGENDIAN |
|
for (i = 0; i < pal_size/4; i++) |
|
ast->pal[i] = av_bswap32(((uint32_t*)pal_src)[i]); |
|
#else |
|
memcpy(ast->pal, pal_src, pal_size); |
|
#endif |
|
ast->has_pal = 1; |
|
} |
|
|
|
print_tag("video", tag1, 0); |
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
|
st->codec->codec_tag = tag1; |
|
st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1); |
|
st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts. |
|
// Support "Resolution 1:1" for Avid AVI Codec |
|
if(tag1 == MKTAG('A', 'V', 'R', 'n') && |
|
st->codec->extradata_size >= 31 && |
|
!memcmp(&st->codec->extradata[28], "1:1", 3)) |
|
st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; |
|
|
|
if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){ |
|
st->codec->extradata_size+= 9; |
|
st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); |
|
if(st->codec->extradata) |
|
memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9); |
|
} |
|
st->codec->height= FFABS(st->codec->height); |
|
|
|
// avio_skip(pb, size - 5 * 4); |
|
break; |
|
case AVMEDIA_TYPE_AUDIO: |
|
ret = ff_get_wav_header(pb, st->codec, size); |
|
if (ret < 0) |
|
return ret; |
|
ast->dshow_block_align= st->codec->block_align; |
|
if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){ |
|
av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align); |
|
ast->sample_size= st->codec->block_align; |
|
} |
|
if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ |
|
avio_skip(pb, 1); |
|
/* Force parsing as several audio frames can be in |
|
* one packet and timestamps refer to packet start. */ |
|
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS; |
|
/* ADTS header is in extradata, AAC without header must be |
|
* stored as exact frames. Parser not needed and it will |
|
* fail. */ |
|
if (st->codec->codec_id == AV_CODEC_ID_AAC && st->codec->extradata_size) |
|
st->need_parsing = AVSTREAM_PARSE_NONE; |
|
/* AVI files with Xan DPCM audio (wrongly) declare PCM |
|
* audio in the header but have Axan as stream_code_tag. */ |
|
if (st->codec->stream_codec_tag == AV_RL32("Axan")){ |
|
st->codec->codec_id = AV_CODEC_ID_XAN_DPCM; |
|
st->codec->codec_tag = 0; |
|
} |
|
if (amv_file_format){ |
|
st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV; |
|
ast->dshow_block_align = 0; |
|
} |
|
break; |
|
case AVMEDIA_TYPE_SUBTITLE: |
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
|
st->codec->codec_id = AV_CODEC_ID_PROBE; |
|
break; |
|
default: |
|
st->codec->codec_type = AVMEDIA_TYPE_DATA; |
|
st->codec->codec_id= AV_CODEC_ID_NONE; |
|
st->codec->codec_tag= 0; |
|
avio_skip(pb, size); |
|
break; |
|
} |
|
} |
|
break; |
|
case MKTAG('i', 'n', 'd', 'x'): |
|
i= avio_tell(pb); |
|
if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && |
|
read_braindead_odml_indx(s, 0) < 0 && |
|
(s->error_recognition & AV_EF_EXPLODE)) |
|
goto fail; |
|
avio_seek(pb, i+size, SEEK_SET); |
|
break; |
|
case MKTAG('v', 'p', 'r', 'p'): |
|
if(stream_index < (unsigned)s->nb_streams && size > 9*4){ |
|
AVRational active, active_aspect; |
|
|
|
st = s->streams[stream_index]; |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
|
|
active_aspect.den= avio_rl16(pb); |
|
active_aspect.num= avio_rl16(pb); |
|
active.num = avio_rl32(pb); |
|
active.den = avio_rl32(pb); |
|
avio_rl32(pb); //nbFieldsPerFrame |
|
|
|
if(active_aspect.num && active_aspect.den && active.num && active.den){ |
|
st->sample_aspect_ratio= av_div_q(active_aspect, active); |
|
av_dlog(s, "vprp %d/%d %d/%d\n", |
|
active_aspect.num, active_aspect.den, |
|
active.num, active.den); |
|
} |
|
size -= 9*4; |
|
} |
|
avio_skip(pb, size); |
|
break; |
|
case MKTAG('s', 't', 'r', 'n'): |
|
if(s->nb_streams){ |
|
ret = avi_read_tag(s, s->streams[s->nb_streams-1], tag, size); |
|
if (ret < 0) |
|
return ret; |
|
break; |
|
} |
|
default: |
|
if(size > 1000000){ |
|
av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, " |
|
"I will ignore it and try to continue anyway.\n"); |
|
if (s->error_recognition & AV_EF_EXPLODE) |
|
goto fail; |
|
avi->movi_list = avio_tell(pb) - 4; |
|
avi->movi_end = avio_size(pb); |
|
goto end_of_header; |
|
} |
|
/* skip tag */ |
|
size += (size & 1); |
|
avio_skip(pb, size); |
|
break; |
|
} |
|
} |
|
end_of_header: |
|
/* check stream number */ |
|
if (stream_index != s->nb_streams - 1) { |
|
fail: |
|
return AVERROR_INVALIDDATA; |
|
} |
|
|
|
if(!avi->index_loaded && pb->seekable) |
|
avi_load_index(s); |
|
avi->index_loaded = 1; |
|
avi->non_interleaved |= guess_ni_flag(s); |
|
for(i=0; i<s->nb_streams; i++){ |
|
AVStream *st = s->streams[i]; |
|
if(st->nb_index_entries) |
|
break; |
|
} |
|
if(i==s->nb_streams && avi->non_interleaved) { |
|
av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n"); |
|
avi->non_interleaved=0; |
|
} |
|
|
|
if(avi->non_interleaved) { |
|
av_log(s, AV_LOG_INFO, "non-interleaved AVI\n"); |
|
clean_index(s); |
|
} |
|
|
|
ff_metadata_conv_ctx(s, NULL, avi_metadata_conv); |
|
ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv); |
|
|
|
return 0; |
|
} |
|
|
|
static int read_gab2_sub(AVStream *st, AVPacket *pkt) { |
|
if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) { |
|
uint8_t desc[256]; |
|
int score = AVPROBE_SCORE_MAX / 2, ret; |
|
AVIStream *ast = st->priv_data; |
|
AVInputFormat *sub_demuxer; |
|
AVRational time_base; |
|
AVIOContext *pb = avio_alloc_context( pkt->data + 7, |
|
pkt->size - 7, |
|
0, NULL, NULL, NULL, NULL); |
|
AVProbeData pd; |
|
unsigned int desc_len = avio_rl32(pb); |
|
|
|
if (desc_len > pb->buf_end - pb->buf_ptr) |
|
goto error; |
|
|
|
ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc)); |
|
avio_skip(pb, desc_len - ret); |
|
if (*desc) |
|
av_dict_set(&st->metadata, "title", desc, 0); |
|
|
|
avio_rl16(pb); /* flags? */ |
|
avio_rl32(pb); /* data size */ |
|
|
|
pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr }; |
|
if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score))) |
|
goto error; |
|
|
|
if (!(ast->sub_ctx = avformat_alloc_context())) |
|
goto error; |
|
|
|
ast->sub_ctx->pb = pb; |
|
if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) { |
|
ff_read_packet(ast->sub_ctx, &ast->sub_pkt); |
|
*st->codec = *ast->sub_ctx->streams[0]->codec; |
|
ast->sub_ctx->streams[0]->codec->extradata = NULL; |
|
time_base = ast->sub_ctx->streams[0]->time_base; |
|
avpriv_set_pts_info(st, 64, time_base.num, time_base.den); |
|
} |
|
ast->sub_buffer = pkt->data; |
|
memset(pkt, 0, sizeof(*pkt)); |
|
return 1; |
|
error: |
|
av_freep(&pb); |
|
} |
|
return 0; |
|
} |
|
|
|
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, |
|
AVPacket *pkt) |
|
{ |
|
AVIStream *ast, *next_ast = next_st->priv_data; |
|
int64_t ts, next_ts, ts_min = INT64_MAX; |
|
AVStream *st, *sub_st = NULL; |
|
int i; |
|
|
|
next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base, |
|
AV_TIME_BASE_Q); |
|
|
|
for (i=0; i<s->nb_streams; i++) { |
|
st = s->streams[i]; |
|
ast = st->priv_data; |
|
if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) { |
|
ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q); |
|
if (ts <= next_ts && ts < ts_min) { |
|
ts_min = ts; |
|
sub_st = st; |
|
} |
|
} |
|
} |
|
|
|
if (sub_st) { |
|
ast = sub_st->priv_data; |
|
*pkt = ast->sub_pkt; |
|
pkt->stream_index = sub_st->index; |
|
if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0) |
|
ast->sub_pkt.data = NULL; |
|
} |
|
return sub_st; |
|
} |
|
|
|
static int get_stream_idx(int *d){ |
|
if( d[0] >= '0' && d[0] <= '9' |
|
&& d[1] >= '0' && d[1] <= '9'){ |
|
return (d[0] - '0') * 10 + (d[1] - '0'); |
|
}else{ |
|
return 100; //invalid stream ID |
|
} |
|
} |
|
|
|
static int avi_sync(AVFormatContext *s, int exit_early) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
int n; |
|
unsigned int d[8]; |
|
unsigned int size; |
|
int64_t i, sync; |
|
|
|
start_sync: |
|
memset(d, -1, sizeof(d)); |
|
for(i=sync=avio_tell(pb); !pb->eof_reached; i++) { |
|
int j; |
|
|
|
for(j=0; j<7; j++) |
|
d[j]= d[j+1]; |
|
d[7]= avio_r8(pb); |
|
|
|
size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); |
|
|
|
n= get_stream_idx(d+2); |
|
av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n", |
|
d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n); |
|
if(i + (uint64_t)size > avi->fsize || d[0] > 127) |
|
continue; |
|
|
|
//parse ix## |
|
if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) |
|
//parse JUNK |
|
||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') |
|
||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){ |
|
avio_skip(pb, size); |
|
goto start_sync; |
|
} |
|
|
|
//parse stray LIST |
|
if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){ |
|
avio_skip(pb, 4); |
|
goto start_sync; |
|
} |
|
|
|
n= get_stream_idx(d); |
|
|
|
if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams) |
|
continue; |
|
|
|
//detect ##ix chunk and skip |
|
if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){ |
|
avio_skip(pb, size); |
|
goto start_sync; |
|
} |
|
|
|
//parse ##dc/##wb |
|
if(n < s->nb_streams){ |
|
AVStream *st; |
|
AVIStream *ast; |
|
st = s->streams[n]; |
|
ast = st->priv_data; |
|
|
|
if(s->nb_streams>=2){ |
|
AVStream *st1 = s->streams[1]; |
|
AVIStream *ast1= st1->priv_data; |
|
//workaround for broken small-file-bug402.avi |
|
if( d[2] == 'w' && d[3] == 'b' |
|
&& n==0 |
|
&& st ->codec->codec_type == AVMEDIA_TYPE_VIDEO |
|
&& st1->codec->codec_type == AVMEDIA_TYPE_AUDIO |
|
&& ast->prefix == 'd'*256+'c' |
|
&& (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count) |
|
){ |
|
n=1; |
|
st = st1; |
|
ast = ast1; |
|
av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n"); |
|
} |
|
} |
|
|
|
|
|
if( (st->discard >= AVDISCARD_DEFAULT && size==0) |
|
/*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering |
|
|| st->discard >= AVDISCARD_ALL){ |
|
if (!exit_early) { |
|
ast->frame_offset += get_duration(ast, size); |
|
} |
|
avio_skip(pb, size); |
|
goto start_sync; |
|
} |
|
|
|
if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) { |
|
int k = avio_r8(pb); |
|
int last = (k + avio_r8(pb) - 1) & 0xFF; |
|
|
|
avio_rl16(pb); //flags |
|
|
|
for (; k <= last; k++) |
|
ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16); |
|
ast->has_pal= 1; |
|
goto start_sync; |
|
} else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) || |
|
d[2]*256+d[3] == ast->prefix /*|| |
|
(d[2] == 'd' && d[3] == 'c') || |
|
(d[2] == 'w' && d[3] == 'b')*/) { |
|
|
|
if (exit_early) |
|
return 0; |
|
if(d[2]*256+d[3] == ast->prefix) |
|
ast->prefix_count++; |
|
else{ |
|
ast->prefix= d[2]*256+d[3]; |
|
ast->prefix_count= 0; |
|
} |
|
|
|
avi->stream_index= n; |
|
ast->packet_size= size + 8; |
|
ast->remaining= size; |
|
|
|
if(size || !ast->sample_size){ |
|
uint64_t pos= avio_tell(pb) - 8; |
|
if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){ |
|
av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME); |
|
} |
|
} |
|
return 0; |
|
} |
|
} |
|
} |
|
|
|
return AVERROR_EOF; |
|
} |
|
|
|
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
int err; |
|
void* dstr; |
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) { |
|
int size = avpriv_dv_get_packet(avi->dv_demux, pkt); |
|
if (size >= 0) |
|
return size; |
|
} |
|
|
|
if(avi->non_interleaved){ |
|
int best_stream_index = 0; |
|
AVStream *best_st= NULL; |
|
AVIStream *best_ast; |
|
int64_t best_ts= INT64_MAX; |
|
int i; |
|
|
|
for(i=0; i<s->nb_streams; i++){ |
|
AVStream *st = s->streams[i]; |
|
AVIStream *ast = st->priv_data; |
|
int64_t ts= ast->frame_offset; |
|
int64_t last_ts; |
|
|
|
if(!st->nb_index_entries) |
|
continue; |
|
|
|
last_ts = st->index_entries[st->nb_index_entries - 1].timestamp; |
|
if(!ast->remaining && ts > last_ts) |
|
continue; |
|
|
|
ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE}); |
|
|
|
av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts, |
|
st->time_base.num, st->time_base.den, ast->frame_offset); |
|
if(ts < best_ts){ |
|
best_ts= ts; |
|
best_st= st; |
|
best_stream_index= i; |
|
} |
|
} |
|
if(!best_st) |
|
return AVERROR_EOF; |
|
|
|
best_ast = best_st->priv_data; |
|
best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base); |
|
if(best_ast->remaining) |
|
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); |
|
else{ |
|
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); |
|
if(i>=0) |
|
best_ast->frame_offset= best_st->index_entries[i].timestamp; |
|
} |
|
|
|
if(i>=0){ |
|
int64_t pos= best_st->index_entries[i].pos; |
|
pos += best_ast->packet_size - best_ast->remaining; |
|
avio_seek(s->pb, pos + 8, SEEK_SET); |
|
|
|
assert(best_ast->remaining <= best_ast->packet_size); |
|
|
|
avi->stream_index= best_stream_index; |
|
if(!best_ast->remaining) |
|
best_ast->packet_size= |
|
best_ast->remaining= best_st->index_entries[i].size; |
|
} |
|
} |
|
|
|
resync: |
|
if(avi->stream_index >= 0){ |
|
AVStream *st= s->streams[ avi->stream_index ]; |
|
AVIStream *ast= st->priv_data; |
|
int size, err; |
|
|
|
if(get_subtitle_pkt(s, st, pkt)) |
|
return 0; |
|
|
|
if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM |
|
size= INT_MAX; |
|
else if(ast->sample_size < 32) |
|
// arbitrary multiplier to avoid tiny packets for raw PCM data |
|
size= 1024*ast->sample_size; |
|
else |
|
size= ast->sample_size; |
|
|
|
if(size > ast->remaining) |
|
size= ast->remaining; |
|
avi->last_pkt_pos= avio_tell(pb); |
|
err= av_get_packet(pb, pkt, size); |
|
if(err<0) |
|
return err; |
|
|
|
if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){ |
|
uint8_t *pal; |
|
pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE); |
|
if(!pal){ |
|
av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n"); |
|
}else{ |
|
memcpy(pal, ast->pal, AVPALETTE_SIZE); |
|
ast->has_pal = 0; |
|
} |
|
} |
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) { |
|
dstr = pkt->destruct; |
|
size = avpriv_dv_produce_packet(avi->dv_demux, pkt, |
|
pkt->data, pkt->size); |
|
pkt->destruct = dstr; |
|
pkt->flags |= AV_PKT_FLAG_KEY; |
|
if (size < 0) |
|
av_free_packet(pkt); |
|
} else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE |
|
&& !st->codec->codec_tag && read_gab2_sub(st, pkt)) { |
|
ast->frame_offset++; |
|
avi->stream_index = -1; |
|
ast->remaining = 0; |
|
goto resync; |
|
} else { |
|
/* XXX: How to handle B-frames in AVI? */ |
|
pkt->dts = ast->frame_offset; |
|
// pkt->dts += ast->start; |
|
if(ast->sample_size) |
|
pkt->dts /= ast->sample_size; |
|
av_dlog(s, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", |
|
pkt->dts, ast->frame_offset, ast->scale, ast->rate, |
|
ast->sample_size, AV_TIME_BASE, avi->stream_index, size); |
|
pkt->stream_index = avi->stream_index; |
|
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { |
|
AVIndexEntry *e; |
|
int index; |
|
assert(st->index_entries); |
|
|
|
index= av_index_search_timestamp(st, ast->frame_offset, 0); |
|
e= &st->index_entries[index]; |
|
|
|
if(index >= 0 && e->timestamp == ast->frame_offset){ |
|
if (e->flags & AVINDEX_KEYFRAME) |
|
pkt->flags |= AV_PKT_FLAG_KEY; |
|
} |
|
} else { |
|
pkt->flags |= AV_PKT_FLAG_KEY; |
|
} |
|
ast->frame_offset += get_duration(ast, pkt->size); |
|
} |
|
ast->remaining -= err; |
|
if(!ast->remaining){ |
|
avi->stream_index= -1; |
|
ast->packet_size= 0; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
if ((err = avi_sync(s, 0)) < 0) |
|
return err; |
|
goto resync; |
|
} |
|
|
|
/* XXX: We make the implicit supposition that the positions are sorted |
|
for each stream. */ |
|
static int avi_read_idx1(AVFormatContext *s, int size) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
int nb_index_entries, i; |
|
AVStream *st; |
|
AVIStream *ast; |
|
unsigned int index, tag, flags, pos, len, first_packet = 1; |
|
unsigned last_pos= -1; |
|
int64_t idx1_pos, first_packet_pos = 0, data_offset = 0; |
|
|
|
nb_index_entries = size / 16; |
|
if (nb_index_entries <= 0) |
|
return AVERROR_INVALIDDATA; |
|
|
|
idx1_pos = avio_tell(pb); |
|
avio_seek(pb, avi->movi_list+4, SEEK_SET); |
|
if (avi_sync(s, 1) == 0) { |
|
first_packet_pos = avio_tell(pb) - 8; |
|
} |
|
avi->stream_index = -1; |
|
avio_seek(pb, idx1_pos, SEEK_SET); |
|
|
|
/* Read the entries and sort them in each stream component. */ |
|
for(i = 0; i < nb_index_entries; i++) { |
|
tag = avio_rl32(pb); |
|
flags = avio_rl32(pb); |
|
pos = avio_rl32(pb); |
|
len = avio_rl32(pb); |
|
av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", |
|
i, tag, flags, pos, len); |
|
|
|
index = ((tag & 0xff) - '0') * 10; |
|
index += ((tag >> 8) & 0xff) - '0'; |
|
if (index >= s->nb_streams) |
|
continue; |
|
st = s->streams[index]; |
|
ast = st->priv_data; |
|
|
|
if(first_packet && first_packet_pos && len) { |
|
data_offset = first_packet_pos - pos; |
|
first_packet = 0; |
|
} |
|
pos += data_offset; |
|
|
|
av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len); |
|
|
|
if(pb->eof_reached) |
|
return AVERROR_INVALIDDATA; |
|
|
|
if(last_pos == pos) |
|
avi->non_interleaved= 1; |
|
else if(len || !ast->sample_size) |
|
av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); |
|
ast->cum_len += get_duration(ast, len); |
|
last_pos= pos; |
|
} |
|
return 0; |
|
} |
|
|
|
static int guess_ni_flag(AVFormatContext *s){ |
|
int i; |
|
int64_t last_start=0; |
|
int64_t first_end= INT64_MAX; |
|
int64_t oldpos= avio_tell(s->pb); |
|
|
|
for(i=0; i<s->nb_streams; i++){ |
|
AVStream *st = s->streams[i]; |
|
int n= st->nb_index_entries; |
|
unsigned int size; |
|
|
|
if(n <= 0) |
|
continue; |
|
|
|
if(n >= 2){ |
|
int64_t pos= st->index_entries[0].pos; |
|
avio_seek(s->pb, pos + 4, SEEK_SET); |
|
size= avio_rl32(s->pb); |
|
if(pos + size > st->index_entries[1].pos) |
|
last_start= INT64_MAX; |
|
} |
|
|
|
if(st->index_entries[0].pos > last_start) |
|
last_start= st->index_entries[0].pos; |
|
if(st->index_entries[n-1].pos < first_end) |
|
first_end= st->index_entries[n-1].pos; |
|
} |
|
avio_seek(s->pb, oldpos, SEEK_SET); |
|
return last_start > first_end; |
|
} |
|
|
|
static int avi_load_index(AVFormatContext *s) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
uint32_t tag, size; |
|
int64_t pos= avio_tell(pb); |
|
int ret = -1; |
|
|
|
if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0) |
|
goto the_end; // maybe truncated file |
|
av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end); |
|
for(;;) { |
|
if (pb->eof_reached) |
|
break; |
|
tag = avio_rl32(pb); |
|
size = avio_rl32(pb); |
|
av_dlog(s, "tag=%c%c%c%c size=0x%x\n", |
|
tag & 0xff, |
|
(tag >> 8) & 0xff, |
|
(tag >> 16) & 0xff, |
|
(tag >> 24) & 0xff, |
|
size); |
|
|
|
if (tag == MKTAG('i', 'd', 'x', '1') && |
|
avi_read_idx1(s, size) >= 0) { |
|
ret = 0; |
|
break; |
|
} |
|
|
|
size += (size & 1); |
|
if (avio_skip(pb, size) < 0) |
|
break; // something is wrong here |
|
} |
|
the_end: |
|
avio_seek(pb, pos, SEEK_SET); |
|
return ret; |
|
} |
|
|
|
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp) |
|
{ |
|
AVIStream *ast2 = st2->priv_data; |
|
int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base); |
|
av_free_packet(&ast2->sub_pkt); |
|
if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 || |
|
avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0) |
|
ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt); |
|
} |
|
|
|
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVStream *st; |
|
int i, index; |
|
int64_t pos; |
|
AVIStream *ast; |
|
|
|
if (!avi->index_loaded) { |
|
/* we only load the index on demand */ |
|
avi_load_index(s); |
|
avi->index_loaded = 1; |
|
} |
|
assert(stream_index>= 0); |
|
|
|
st = s->streams[stream_index]; |
|
ast= st->priv_data; |
|
index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags); |
|
if(index<0) |
|
return AVERROR_INVALIDDATA; |
|
|
|
/* find the position */ |
|
pos = st->index_entries[index].pos; |
|
timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1); |
|
|
|
av_dlog(s, "XX %"PRId64" %d %"PRId64"\n", |
|
timestamp, index, st->index_entries[index].timestamp); |
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) { |
|
/* One and only one real stream for DV in AVI, and it has video */ |
|
/* offsets. Calling with other stream indexes should have failed */ |
|
/* the av_index_search_timestamp call above. */ |
|
assert(stream_index == 0); |
|
|
|
/* Feed the DV video stream version of the timestamp to the */ |
|
/* DV demux so it can synthesize correct timestamps. */ |
|
ff_dv_offset_reset(avi->dv_demux, timestamp); |
|
|
|
avio_seek(s->pb, pos, SEEK_SET); |
|
avi->stream_index= -1; |
|
return 0; |
|
} |
|
|
|
for(i = 0; i < s->nb_streams; i++) { |
|
AVStream *st2 = s->streams[i]; |
|
AVIStream *ast2 = st2->priv_data; |
|
|
|
ast2->packet_size= |
|
ast2->remaining= 0; |
|
|
|
if (ast2->sub_ctx) { |
|
seek_subtitle(st, st2, timestamp); |
|
continue; |
|
} |
|
|
|
if (st2->nb_index_entries <= 0) |
|
continue; |
|
|
|
// assert(st2->codec->block_align); |
|
assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale); |
|
index = av_index_search_timestamp( |
|
st2, |
|
av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), |
|
flags | AVSEEK_FLAG_BACKWARD); |
|
if(index<0) |
|
index=0; |
|
|
|
if(!avi->non_interleaved){ |
|
while(index>0 && st2->index_entries[index].pos > pos) |
|
index--; |
|
while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos) |
|
index++; |
|
} |
|
|
|
av_dlog(s, "%"PRId64" %d %"PRId64"\n", |
|
timestamp, index, st2->index_entries[index].timestamp); |
|
/* extract the current frame number */ |
|
ast2->frame_offset = st2->index_entries[index].timestamp; |
|
} |
|
|
|
/* do the seek */ |
|
avio_seek(s->pb, pos, SEEK_SET); |
|
avi->stream_index= -1; |
|
return 0; |
|
} |
|
|
|
static int avi_read_close(AVFormatContext *s) |
|
{ |
|
int i; |
|
AVIContext *avi = s->priv_data; |
|
|
|
for(i=0;i<s->nb_streams;i++) { |
|
AVStream *st = s->streams[i]; |
|
AVIStream *ast = st->priv_data; |
|
if (ast) { |
|
if (ast->sub_ctx) { |
|
av_freep(&ast->sub_ctx->pb); |
|
avformat_close_input(&ast->sub_ctx); |
|
} |
|
av_free(ast->sub_buffer); |
|
av_free_packet(&ast->sub_pkt); |
|
} |
|
} |
|
|
|
av_free(avi->dv_demux); |
|
|
|
return 0; |
|
} |
|
|
|
static int avi_probe(AVProbeData *p) |
|
{ |
|
int i; |
|
|
|
/* check file header */ |
|
for(i=0; avi_headers[i][0]; i++) |
|
if(!memcmp(p->buf , avi_headers[i] , 4) && |
|
!memcmp(p->buf+8, avi_headers[i]+4, 4)) |
|
return AVPROBE_SCORE_MAX; |
|
|
|
return 0; |
|
} |
|
|
|
AVInputFormat ff_avi_demuxer = { |
|
.name = "avi", |
|
.long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"), |
|
.priv_data_size = sizeof(AVIContext), |
|
.read_probe = avi_probe, |
|
.read_header = avi_read_header, |
|
.read_packet = avi_read_packet, |
|
.read_close = avi_read_close, |
|
.read_seek = avi_read_seek, |
|
};
|
|
|