mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
11 years ago
committed by
Vittorio Giovara
parent
6f273093e5
commit
eeadcdfd1a
6 changed files with 262 additions and 1 deletions
@ -0,0 +1,256 @@ |
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/*
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* LucasArts Smush demuxer |
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* Copyright (c) 2006 Cyril Zorin |
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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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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "avio.h" |
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#include "internal.h" |
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typedef struct SMUSHContext { |
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int version; |
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int audio_stream_index; |
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int video_stream_index; |
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} SMUSHContext; |
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static int smush_read_probe(AVProbeData *p) |
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{ |
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if (((AV_RL32(p->buf) == MKTAG('S', 'A', 'N', 'M') && |
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AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) || |
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(AV_RL32(p->buf) == MKTAG('A', 'N', 'I', 'M') && |
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AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) { |
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return AVPROBE_SCORE_MAX; |
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} |
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return 0; |
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} |
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static int smush_read_header(AVFormatContext *ctx) |
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{ |
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SMUSHContext *smush = ctx->priv_data; |
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AVIOContext *pb = ctx->pb; |
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AVStream *vst, *ast; |
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uint32_t magic, nframes, size, subversion, i; |
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uint32_t width = 0, height = 0, got_audio = 0, read = 0; |
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uint32_t sample_rate, channels, palette[256]; |
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magic = avio_rb32(pb); |
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avio_skip(pb, 4); // skip movie size
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if (magic == MKBETAG('A', 'N', 'I', 'M')) { |
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if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R')) |
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return AVERROR_INVALIDDATA; |
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size = avio_rb32(pb); |
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if (size < 3 * 256 + 6) |
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return AVERROR_INVALIDDATA; |
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smush->version = 0; |
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subversion = avio_rl16(pb); |
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nframes = avio_rl16(pb); |
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if (!nframes) |
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return AVERROR_INVALIDDATA; |
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avio_skip(pb, 2); // skip pad
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for (i = 0; i < 256; i++) |
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palette[i] = avio_rb24(pb); |
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avio_skip(pb, size - (3 * 256 + 6)); |
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} else if (magic == MKBETAG('S', 'A', 'N', 'M')) { |
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if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R')) |
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return AVERROR_INVALIDDATA; |
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size = avio_rb32(pb); |
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if (size < 14) |
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return AVERROR_INVALIDDATA; |
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smush->version = 1; |
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subversion = avio_rl16(pb); |
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nframes = avio_rl32(pb); |
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if (!nframes) |
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return AVERROR_INVALIDDATA; |
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avio_skip(pb, 2); // skip pad
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width = avio_rl16(pb); |
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height = avio_rl16(pb); |
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avio_skip(pb, 2); // skip pad
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avio_skip(pb, size - 14); |
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if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D')) |
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return AVERROR_INVALIDDATA; |
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size = avio_rb32(pb); |
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while (!got_audio && ((read + 8) < size)) { |
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uint32_t sig, chunk_size; |
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if (pb->eof_reached) |
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return AVERROR_EOF; |
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sig = avio_rb32(pb); |
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chunk_size = avio_rb32(pb); |
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read += 8; |
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switch (sig) { |
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case MKBETAG('W', 'a', 'v', 'e'): |
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got_audio = 1; |
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sample_rate = avio_rl32(pb); |
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if (!sample_rate) |
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return AVERROR_INVALIDDATA; |
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channels = avio_rl32(pb); |
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if (!channels) |
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return AVERROR_INVALIDDATA; |
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avio_skip(pb, chunk_size - 8); |
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read += chunk_size; |
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break; |
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case MKBETAG('B', 'l', '1', '6'): |
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case MKBETAG('A', 'N', 'N', 'O'): |
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avio_skip(pb, chunk_size); |
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read += chunk_size; |
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break; |
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default: |
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return AVERROR_INVALIDDATA; |
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break; |
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} |
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} |
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avio_skip(pb, size - read); |
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} else { |
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av_log(ctx, AV_LOG_ERROR, "Wrong magic\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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vst = avformat_new_stream(ctx, 0); |
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if (!vst) |
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return AVERROR(ENOMEM); |
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smush->video_stream_index = vst->index; |
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avpriv_set_pts_info(vst, 64, 1, 15); |
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vst->start_time = 0; |
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vst->duration = |
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vst->nb_frames = nframes; |
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vst->avg_frame_rate = av_inv_q(vst->time_base); |
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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vst->codec->codec_id = AV_CODEC_ID_SANM; |
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vst->codec->codec_tag = 0; |
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vst->codec->width = width; |
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vst->codec->height = height; |
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if (!smush->version) { |
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av_free(vst->codec->extradata); |
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vst->codec->extradata_size = 1024 + 2; |
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vst->codec->extradata = av_malloc(vst->codec->extradata_size + |
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FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!vst->codec->extradata) |
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return AVERROR(ENOMEM); |
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AV_WL16(vst->codec->extradata, subversion); |
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for (i = 0; i < 256; i++) |
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AV_WL32(vst->codec->extradata + 2 + i * 4, palette[i]); |
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} |
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if (got_audio) { |
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ast = avformat_new_stream(ctx, 0); |
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if (!ast) |
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return AVERROR(ENOMEM); |
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smush->audio_stream_index = ast->index; |
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ast->start_time = 0; |
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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ast->codec->codec_id = AV_CODEC_ID_ADPCM_VIMA; |
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ast->codec->codec_tag = 0; |
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ast->codec->sample_rate = sample_rate; |
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ast->codec->channels = channels; |
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avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); |
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} |
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return 0; |
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} |
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static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt) |
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{ |
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SMUSHContext *smush = ctx->priv_data; |
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AVIOContext *pb = ctx->pb; |
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int done = 0; |
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int ret; |
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while (!done) { |
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uint32_t sig, size; |
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if (pb->eof_reached) |
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return AVERROR_EOF; |
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sig = avio_rb32(pb); |
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size = avio_rb32(pb); |
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switch (sig) { |
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case MKBETAG('F', 'R', 'M', 'E'): |
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if (smush->version) |
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break; |
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if ((ret = av_get_packet(pb, pkt, size)) < 0) |
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return ret; |
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pkt->stream_index = smush->video_stream_index; |
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done = 1; |
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break; |
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case MKBETAG('B', 'l', '1', '6'): |
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if ((ret = av_get_packet(pb, pkt, size)) < 0) |
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return ret; |
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pkt->stream_index = smush->video_stream_index; |
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pkt->duration = 1; |
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done = 1; |
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break; |
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case MKBETAG('W', 'a', 'v', 'e'): |
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if (size < 13) |
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return AVERROR_INVALIDDATA; |
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if (av_get_packet(pb, pkt, size) < 13) |
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return AVERROR(EIO); |
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pkt->stream_index = smush->audio_stream_index; |
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pkt->flags |= AV_PKT_FLAG_KEY; |
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pkt->duration = AV_RB32(pkt->data); |
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if (pkt->duration == 0xFFFFFFFFu) |
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pkt->duration = AV_RB32(pkt->data + 8); |
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done = 1; |
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break; |
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default: |
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avio_skip(pb, size); |
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break; |
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} |
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} |
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return 0; |
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} |
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AVInputFormat ff_smush_demuxer = { |
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.name = "smush", |
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.long_name = NULL_IF_CONFIG_SMALL("LucasArts Smush"), |
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.priv_data_size = sizeof(SMUSHContext), |
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.read_probe = smush_read_probe, |
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.read_header = smush_read_header, |
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.read_packet = smush_read_packet, |
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}; |
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