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959 lines
30 KiB
959 lines
30 KiB
/* |
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* nut muxer |
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* Copyright (c) 2004-2007 Michael Niedermayer |
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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/tree.h" |
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#include "libavutil/dict.h" |
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#include "libavcodec/mpegaudiodata.h" |
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#include "nut.h" |
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#include "internal.h" |
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#include "avio_internal.h" |
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#include "riff.h" |
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|
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static int find_expected_header(AVCodecContext *c, int size, int key_frame, |
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uint8_t out[64]) |
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{ |
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int sample_rate = c->sample_rate; |
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|
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if (size > 4096) |
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return 0; |
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|
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AV_WB24(out, 1); |
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|
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if (c->codec_id == AV_CODEC_ID_MPEG4) { |
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if (key_frame) { |
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return 3; |
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} else { |
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out[3] = 0xB6; |
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return 4; |
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} |
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} else if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO || |
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c->codec_id == AV_CODEC_ID_MPEG2VIDEO) { |
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return 3; |
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} else if (c->codec_id == AV_CODEC_ID_H264) { |
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return 3; |
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} else if (c->codec_id == AV_CODEC_ID_MP3 || |
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c->codec_id == AV_CODEC_ID_MP2) { |
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int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size; |
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int layer = c->codec_id == AV_CODEC_ID_MP3 ? 3 : 2; |
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unsigned int header = 0xFFF00000; |
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lsf = sample_rate < (24000 + 32000) / 2; |
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mpeg25 = sample_rate < (12000 + 16000) / 2; |
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sample_rate <<= lsf + mpeg25; |
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if (sample_rate < (32000 + 44100) / 2) |
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sample_rate_index = 2; |
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else if (sample_rate < (44100 + 48000) / 2) |
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sample_rate_index = 0; |
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else |
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sample_rate_index = 1; |
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sample_rate = avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); |
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for (bitrate_index = 2; bitrate_index < 30; bitrate_index++) { |
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frame_size = |
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avpriv_mpa_bitrate_tab[lsf][layer - 1][bitrate_index >> 1]; |
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frame_size = (frame_size * 144000) / (sample_rate << lsf) + |
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(bitrate_index & 1); |
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if (frame_size == size) |
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break; |
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} |
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header |= (!lsf) << 19; |
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header |= (4 - layer) << 17; |
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header |= 1 << 16; //no crc |
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AV_WB32(out, header); |
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if (size <= 0) |
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return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead |
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if (bitrate_index == 30) |
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return -1; //something is wrong ... |
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header |= (bitrate_index >> 1) << 12; |
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header |= sample_rate_index << 10; |
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header |= (bitrate_index & 1) << 9; |
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return 2; //FIXME actually put the needed ones in build_elision_headers() |
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//return 3; //we guess that the private bit is not set |
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//FIXME the above assumptions should be checked, if these turn out false too often something should be done |
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} |
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return 0; |
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} |
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static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, |
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int frame_type) |
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{ |
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NUTContext *nut = s->priv_data; |
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uint8_t out[64]; |
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int i; |
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int len = find_expected_header(c, size, frame_type, out); |
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|
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for (i = 1; i < nut->header_count; i++) { |
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if (len == nut->header_len[i] && !memcmp(out, nut->header[i], len)) { |
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return i; |
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} |
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} |
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return 0; |
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} |
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static void build_elision_headers(AVFormatContext *s) |
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{ |
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NUTContext *nut = s->priv_data; |
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int i; |
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//FIXME this is lame |
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//FIXME write a 2pass mode to find the maximal headers |
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static const uint8_t headers[][5] = { |
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{ 3, 0x00, 0x00, 0x01 }, |
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{ 4, 0x00, 0x00, 0x01, 0xB6}, |
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{ 2, 0xFF, 0xFA }, //mp3+crc |
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{ 2, 0xFF, 0xFB }, //mp3 |
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{ 2, 0xFF, 0xFC }, //mp2+crc |
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{ 2, 0xFF, 0xFD }, //mp2 |
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}; |
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nut->header_count = 7; |
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for (i = 1; i < nut->header_count; i++) { |
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nut->header_len[i] = headers[i - 1][0]; |
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nut->header[i] = &headers[i - 1][1]; |
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} |
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} |
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static void build_frame_code(AVFormatContext *s) |
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{ |
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NUTContext *nut = s->priv_data; |
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int key_frame, index, pred, stream_id; |
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int start = 1; |
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int end = 254; |
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int keyframe_0_esc = s->nb_streams > 2; |
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int pred_table[10]; |
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FrameCode *ft; |
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ft = &nut->frame_code[start]; |
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ft->flags = FLAG_CODED; |
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ft->size_mul = 1; |
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ft->pts_delta = 1; |
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start++; |
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if (keyframe_0_esc) { |
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/* keyframe = 0 escape */ |
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FrameCode *ft = &nut->frame_code[start]; |
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ft->flags = FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS; |
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ft->size_mul = 1; |
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start++; |
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} |
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for (stream_id = 0; stream_id < s->nb_streams; stream_id++) { |
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int start2 = start + (end - start) * stream_id / s->nb_streams; |
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int end2 = start + (end - start) * (stream_id + 1) / s->nb_streams; |
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AVCodecContext *codec = s->streams[stream_id]->codec; |
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int is_audio = codec->codec_type == AVMEDIA_TYPE_AUDIO; |
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int intra_only = /*codec->intra_only || */ is_audio; |
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int pred_count; |
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for (key_frame = 0; key_frame < 2; key_frame++) { |
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if (!intra_only || !keyframe_0_esc || key_frame != 0) { |
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FrameCode *ft = &nut->frame_code[start2]; |
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ft->flags = FLAG_KEY * key_frame; |
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ft->flags |= FLAG_SIZE_MSB | FLAG_CODED_PTS; |
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ft->stream_id = stream_id; |
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ft->size_mul = 1; |
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if (is_audio) |
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ft->header_idx = find_header_idx(s, codec, -1, key_frame); |
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start2++; |
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} |
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} |
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key_frame = intra_only; |
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if (is_audio) { |
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int frame_bytes = codec->frame_size * (int64_t)codec->bit_rate / |
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(8 * codec->sample_rate); |
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int pts; |
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for (pts = 0; pts < 2; pts++) |
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for (pred = 0; pred < 2; pred++) { |
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FrameCode *ft = &nut->frame_code[start2]; |
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ft->flags = FLAG_KEY * key_frame; |
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ft->stream_id = stream_id; |
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ft->size_mul = frame_bytes + 2; |
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ft->size_lsb = frame_bytes + pred; |
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ft->pts_delta = pts; |
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ft->header_idx = find_header_idx(s, codec, frame_bytes + pred, key_frame); |
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start2++; |
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} |
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} else { |
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FrameCode *ft = &nut->frame_code[start2]; |
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ft->flags = FLAG_KEY | FLAG_SIZE_MSB; |
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ft->stream_id = stream_id; |
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ft->size_mul = 1; |
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ft->pts_delta = 1; |
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start2++; |
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} |
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if (codec->has_b_frames) { |
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pred_count = 5; |
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pred_table[0] = -2; |
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pred_table[1] = -1; |
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pred_table[2] = 1; |
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pred_table[3] = 3; |
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pred_table[4] = 4; |
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} else if (codec->codec_id == AV_CODEC_ID_VORBIS) { |
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pred_count = 3; |
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pred_table[0] = 2; |
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pred_table[1] = 9; |
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pred_table[2] = 16; |
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} else { |
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pred_count = 1; |
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pred_table[0] = 1; |
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} |
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for (pred = 0; pred < pred_count; pred++) { |
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int start3 = start2 + (end2 - start2) * pred / pred_count; |
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int end3 = start2 + (end2 - start2) * (pred + 1) / pred_count; |
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for (index = start3; index < end3; index++) { |
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FrameCode *ft = &nut->frame_code[index]; |
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ft->flags = FLAG_KEY * key_frame; |
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ft->flags |= FLAG_SIZE_MSB; |
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ft->stream_id = stream_id; |
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//FIXME use single byte size and pred from last |
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ft->size_mul = end3 - start3; |
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ft->size_lsb = index - start3; |
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ft->pts_delta = pred_table[pred]; |
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if (is_audio) |
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ft->header_idx = find_header_idx(s, codec, -1, key_frame); |
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} |
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} |
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} |
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memmove(&nut->frame_code['N' + 1], &nut->frame_code['N'], |
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sizeof(FrameCode) * (255 - 'N')); |
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nut->frame_code[0].flags = |
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nut->frame_code[255].flags = |
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nut->frame_code['N'].flags = FLAG_INVALID; |
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} |
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static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, |
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uint64_t val) |
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{ |
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val *= nut->time_base_count; |
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val += time_base - nut->time_base; |
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ff_put_v(bc, val); |
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} |
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/** |
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* Store a string as vb. |
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*/ |
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static void put_str(AVIOContext *bc, const char *string) |
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{ |
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int len = strlen(string); |
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ff_put_v(bc, len); |
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avio_write(bc, string, len); |
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} |
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static void put_s(AVIOContext *bc, int64_t val) |
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{ |
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ff_put_v(bc, 2 * FFABS(val) - (val > 0)); |
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} |
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#ifdef TRACE |
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static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, const char *file, |
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const char *func, int line) |
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{ |
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av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); |
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ff_put_v(bc, v); |
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} |
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static inline void put_s_trace(AVIOContext *bc, int64_t v, const char *file, |
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const char *func, int line) |
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{ |
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av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); |
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put_s(bc, v); |
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} |
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#define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
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#define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
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#endif |
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//FIXME remove calculate_checksum |
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static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, |
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int calculate_checksum, uint64_t startcode) |
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{ |
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uint8_t *dyn_buf = NULL; |
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int dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); |
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int forw_ptr = dyn_size + 4 * calculate_checksum; |
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if (forw_ptr > 4096) |
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ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); |
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avio_wb64(bc, startcode); |
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ff_put_v(bc, forw_ptr); |
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if (forw_ptr > 4096) |
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avio_wl32(bc, ffio_get_checksum(bc)); |
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if (calculate_checksum) |
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ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); |
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avio_write(bc, dyn_buf, dyn_size); |
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if (calculate_checksum) |
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avio_wl32(bc, ffio_get_checksum(bc)); |
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av_free(dyn_buf); |
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} |
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static void write_mainheader(NUTContext *nut, AVIOContext *bc) |
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{ |
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int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, |
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tmp_head_idx; |
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int64_t tmp_match; |
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ff_put_v(bc, NUT_VERSION); |
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ff_put_v(bc, nut->avf->nb_streams); |
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ff_put_v(bc, nut->max_distance); |
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ff_put_v(bc, nut->time_base_count); |
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for (i = 0; i < nut->time_base_count; i++) { |
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ff_put_v(bc, nut->time_base[i].num); |
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ff_put_v(bc, nut->time_base[i].den); |
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} |
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tmp_pts = 0; |
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tmp_mul = 1; |
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tmp_stream = 0; |
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tmp_match = 1 - (1LL << 62); |
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tmp_head_idx = 0; |
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for (i = 0; i < 256; ) { |
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tmp_fields = 0; |
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tmp_size = 0; |
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// tmp_res=0; |
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if (tmp_pts != nut->frame_code[i].pts_delta) |
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tmp_fields = 1; |
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if (tmp_mul != nut->frame_code[i].size_mul) |
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tmp_fields = 2; |
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if (tmp_stream != nut->frame_code[i].stream_id) |
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tmp_fields = 3; |
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if (tmp_size != nut->frame_code[i].size_lsb) |
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tmp_fields = 4; |
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// if(tmp_res != nut->frame_code[i].res ) tmp_fields=5; |
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if (tmp_head_idx != nut->frame_code[i].header_idx) |
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tmp_fields = 8; |
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tmp_pts = nut->frame_code[i].pts_delta; |
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tmp_flags = nut->frame_code[i].flags; |
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tmp_stream = nut->frame_code[i].stream_id; |
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tmp_mul = nut->frame_code[i].size_mul; |
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tmp_size = nut->frame_code[i].size_lsb; |
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// tmp_res = nut->frame_code[i].res; |
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tmp_head_idx = nut->frame_code[i].header_idx; |
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for (j = 0; i < 256; j++, i++) { |
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if (i == 'N') { |
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j--; |
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continue; |
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} |
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if (nut->frame_code[i].pts_delta != tmp_pts || |
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nut->frame_code[i].flags != tmp_flags || |
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nut->frame_code[i].stream_id != tmp_stream || |
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nut->frame_code[i].size_mul != tmp_mul || |
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nut->frame_code[i].size_lsb != tmp_size + j || |
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// nut->frame_code[i].res != tmp_res || |
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nut->frame_code[i].header_idx != tmp_head_idx) |
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break; |
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} |
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if (j != tmp_mul - tmp_size) |
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tmp_fields = 6; |
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ff_put_v(bc, tmp_flags); |
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ff_put_v(bc, tmp_fields); |
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if (tmp_fields > 0) |
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put_s(bc, tmp_pts); |
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if (tmp_fields > 1) |
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ff_put_v(bc, tmp_mul); |
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if (tmp_fields > 2) |
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ff_put_v(bc, tmp_stream); |
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if (tmp_fields > 3) |
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ff_put_v(bc, tmp_size); |
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if (tmp_fields > 4) |
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ff_put_v(bc, 0 /*tmp_res*/); |
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if (tmp_fields > 5) |
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ff_put_v(bc, j); |
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if (tmp_fields > 6) |
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ff_put_v(bc, tmp_match); |
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if (tmp_fields > 7) |
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ff_put_v(bc, tmp_head_idx); |
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} |
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ff_put_v(bc, nut->header_count - 1); |
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for (i = 1; i < nut->header_count; i++) { |
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ff_put_v(bc, nut->header_len[i]); |
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avio_write(bc, nut->header[i], nut->header_len[i]); |
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} |
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} |
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static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, |
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AVStream *st, int i) |
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{ |
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NUTContext *nut = avctx->priv_data; |
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AVCodecContext *codec = st->codec; |
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unsigned codec_tag = av_codec_get_tag(ff_nut_codec_tags, codec->codec_id); |
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|
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ff_put_v(bc, i); |
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switch (codec->codec_type) { |
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case AVMEDIA_TYPE_VIDEO: |
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ff_put_v(bc, 0); |
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break; |
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case AVMEDIA_TYPE_AUDIO: |
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ff_put_v(bc, 1); |
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break; |
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case AVMEDIA_TYPE_SUBTITLE: |
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ff_put_v(bc, 2); |
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break; |
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default: |
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ff_put_v(bc, 3); |
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break; |
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} |
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ff_put_v(bc, 4); |
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|
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if (!codec_tag || codec->codec_id == AV_CODEC_ID_RAWVIDEO) |
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codec_tag = codec->codec_tag; |
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|
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if (codec_tag) { |
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avio_wl32(bc, codec_tag); |
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} else { |
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av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i); |
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return AVERROR(EINVAL); |
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} |
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|
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ff_put_v(bc, nut->stream[i].time_base - nut->time_base); |
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ff_put_v(bc, nut->stream[i].msb_pts_shift); |
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ff_put_v(bc, nut->stream[i].max_pts_distance); |
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ff_put_v(bc, codec->has_b_frames); |
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avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ |
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|
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ff_put_v(bc, codec->extradata_size); |
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avio_write(bc, codec->extradata, codec->extradata_size); |
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|
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switch (codec->codec_type) { |
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case AVMEDIA_TYPE_AUDIO: |
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ff_put_v(bc, codec->sample_rate); |
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ff_put_v(bc, 1); |
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ff_put_v(bc, codec->channels); |
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break; |
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case AVMEDIA_TYPE_VIDEO: |
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ff_put_v(bc, codec->width); |
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ff_put_v(bc, codec->height); |
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|
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if (st->sample_aspect_ratio.num <= 0 || |
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st->sample_aspect_ratio.den <= 0) { |
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ff_put_v(bc, 0); |
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ff_put_v(bc, 0); |
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} else { |
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ff_put_v(bc, st->sample_aspect_ratio.num); |
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ff_put_v(bc, st->sample_aspect_ratio.den); |
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} |
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ff_put_v(bc, 0); /* csp type -- unknown */ |
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break; |
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default: |
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break; |
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} |
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return 0; |
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} |
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|
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static int add_info(AVIOContext *bc, const char *type, const char *value) |
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{ |
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put_str(bc, type); |
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put_s(bc, -1); |
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put_str(bc, value); |
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return 1; |
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} |
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|
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static int write_globalinfo(NUTContext *nut, AVIOContext *bc) |
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{ |
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AVFormatContext *s = nut->avf; |
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AVDictionaryEntry *t = NULL; |
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AVIOContext *dyn_bc; |
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uint8_t *dyn_buf = NULL; |
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int count = 0, dyn_size; |
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int ret = avio_open_dyn_buf(&dyn_bc); |
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if (ret < 0) |
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return ret; |
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|
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while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) |
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count += add_info(dyn_bc, t->key, t->value); |
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|
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ff_put_v(bc, 0); //stream_if_plus1 |
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ff_put_v(bc, 0); //chapter_id |
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ff_put_v(bc, 0); //timestamp_start |
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ff_put_v(bc, 0); //length |
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|
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ff_put_v(bc, count); |
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|
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dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); |
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avio_write(bc, dyn_buf, dyn_size); |
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av_free(dyn_buf); |
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return 0; |
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} |
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|
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static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){ |
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AVFormatContext *s= nut->avf; |
|
AVStream* st = s->streams[stream_id]; |
|
AVIOContext *dyn_bc; |
|
uint8_t *dyn_buf=NULL; |
|
int count=0, dyn_size, i; |
|
int ret = avio_open_dyn_buf(&dyn_bc); |
|
if(ret < 0) |
|
return ret; |
|
|
|
for (i=0; ff_nut_dispositions[i].flag; ++i) { |
|
if (st->disposition & ff_nut_dispositions[i].flag) |
|
count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str); |
|
} |
|
dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); |
|
|
|
if (count) { |
|
ff_put_v(bc, stream_id + 1); //stream_id_plus1 |
|
ff_put_v(bc, 0); //chapter_id |
|
ff_put_v(bc, 0); //timestamp_start |
|
ff_put_v(bc, 0); //length |
|
|
|
ff_put_v(bc, count); |
|
|
|
avio_write(bc, dyn_buf, dyn_size); |
|
} |
|
|
|
av_free(dyn_buf); |
|
return count; |
|
} |
|
|
|
static int write_chapter(NUTContext *nut, AVIOContext *bc, int id) |
|
{ |
|
AVIOContext *dyn_bc; |
|
uint8_t *dyn_buf = NULL; |
|
AVDictionaryEntry *t = NULL; |
|
AVChapter *ch = nut->avf->chapters[id]; |
|
int ret, dyn_size, count = 0; |
|
|
|
ret = avio_open_dyn_buf(&dyn_bc); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ff_put_v(bc, 0); // stream_id_plus1 |
|
put_s(bc, id + 1); // chapter_id |
|
put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start |
|
ff_put_v(bc, ch->end - ch->start); // chapter_len |
|
|
|
while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) |
|
count += add_info(dyn_bc, t->key, t->value); |
|
|
|
ff_put_v(bc, count); |
|
|
|
dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); |
|
avio_write(bc, dyn_buf, dyn_size); |
|
av_freep(&dyn_buf); |
|
return 0; |
|
} |
|
|
|
static int write_headers(AVFormatContext *avctx, AVIOContext *bc) |
|
{ |
|
NUTContext *nut = avctx->priv_data; |
|
AVIOContext *dyn_bc; |
|
int i, ret; |
|
|
|
ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL); |
|
|
|
ret = avio_open_dyn_buf(&dyn_bc); |
|
if (ret < 0) |
|
return ret; |
|
write_mainheader(nut, dyn_bc); |
|
put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE); |
|
|
|
for (i = 0; i < nut->avf->nb_streams; i++) { |
|
ret = avio_open_dyn_buf(&dyn_bc); |
|
if (ret < 0) |
|
return ret; |
|
ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i); |
|
if (ret < 0) |
|
return ret; |
|
put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE); |
|
} |
|
|
|
ret = avio_open_dyn_buf(&dyn_bc); |
|
if (ret < 0) |
|
return ret; |
|
write_globalinfo(nut, dyn_bc); |
|
put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); |
|
|
|
for (i = 0; i < nut->avf->nb_streams; i++) { |
|
ret = avio_open_dyn_buf(&dyn_bc); |
|
if (ret < 0) |
|
return ret; |
|
ret = write_streaminfo(nut, dyn_bc, i); |
|
if (ret < 0) |
|
return ret; |
|
if (ret > 0) |
|
put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); |
|
else { |
|
uint8_t *buf; |
|
avio_close_dyn_buf(dyn_bc, &buf); |
|
av_free(buf); |
|
} |
|
} |
|
|
|
for (i = 0; i < nut->avf->nb_chapters; i++) { |
|
ret = avio_open_dyn_buf(&dyn_bc); |
|
if (ret < 0) |
|
return ret; |
|
ret = write_chapter(nut, dyn_bc, i); |
|
if (ret < 0) { |
|
uint8_t *buf; |
|
avio_close_dyn_buf(dyn_bc, &buf); |
|
av_freep(&buf); |
|
return ret; |
|
} |
|
put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); |
|
} |
|
|
|
nut->last_syncpoint_pos = INT_MIN; |
|
nut->header_count++; |
|
return 0; |
|
} |
|
|
|
static int nut_write_header(AVFormatContext *s) |
|
{ |
|
NUTContext *nut = s->priv_data; |
|
AVIOContext *bc = s->pb; |
|
int i, j, ret; |
|
|
|
nut->avf = s; |
|
|
|
nut->stream = av_mallocz(sizeof(StreamContext) * s->nb_streams); |
|
if (s->nb_chapters) |
|
nut->chapter = av_mallocz(sizeof(ChapterContext) * s->nb_chapters); |
|
nut->time_base = av_mallocz(sizeof(AVRational) * (s->nb_streams + |
|
s->nb_chapters)); |
|
if (!nut->stream || (s->nb_chapters && !nut->chapter) || !nut->time_base) { |
|
av_freep(&nut->stream); |
|
av_freep(&nut->chapter); |
|
av_freep(&nut->time_base); |
|
return AVERROR(ENOMEM); |
|
} |
|
|
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st = s->streams[i]; |
|
int ssize; |
|
AVRational time_base; |
|
ff_parse_specific_params(st->codec, &time_base.den, &ssize, |
|
&time_base.num); |
|
|
|
avpriv_set_pts_info(st, 64, time_base.num, time_base.den); |
|
|
|
for (j = 0; j < nut->time_base_count; j++) |
|
if (!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))) { |
|
break; |
|
} |
|
nut->time_base[j] = time_base; |
|
nut->stream[i].time_base = &nut->time_base[j]; |
|
if (j == nut->time_base_count) |
|
nut->time_base_count++; |
|
|
|
if (INT64_C(1000) * time_base.num >= time_base.den) |
|
nut->stream[i].msb_pts_shift = 7; |
|
else |
|
nut->stream[i].msb_pts_shift = 14; |
|
nut->stream[i].max_pts_distance = |
|
FFMAX(time_base.den, time_base.num) / time_base.num; |
|
} |
|
|
|
for (i = 0; i < s->nb_chapters; i++) { |
|
AVChapter *ch = s->chapters[i]; |
|
|
|
for (j = 0; j < nut->time_base_count; j++) |
|
if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational))) |
|
break; |
|
|
|
nut->time_base[j] = ch->time_base; |
|
nut->chapter[i].time_base = &nut->time_base[j]; |
|
if (j == nut->time_base_count) |
|
nut->time_base_count++; |
|
} |
|
|
|
nut->max_distance = MAX_DISTANCE; |
|
build_elision_headers(s); |
|
build_frame_code(s); |
|
assert(nut->frame_code['N'].flags == FLAG_INVALID); |
|
|
|
avio_write(bc, ID_STRING, strlen(ID_STRING)); |
|
avio_w8(bc, 0); |
|
|
|
if ((ret = write_headers(s, bc)) < 0) |
|
return ret; |
|
|
|
avio_flush(bc); |
|
|
|
//FIXME index |
|
|
|
return 0; |
|
} |
|
|
|
static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, |
|
AVPacket *pkt) |
|
{ |
|
int flags = 0; |
|
|
|
if (pkt->flags & AV_PKT_FLAG_KEY) |
|
flags |= FLAG_KEY; |
|
if (pkt->stream_index != fc->stream_id) |
|
flags |= FLAG_STREAM_ID; |
|
if (pkt->size / fc->size_mul) |
|
flags |= FLAG_SIZE_MSB; |
|
if (pkt->pts - nus->last_pts != fc->pts_delta) |
|
flags |= FLAG_CODED_PTS; |
|
if (pkt->size > 2 * nut->max_distance) |
|
flags |= FLAG_CHECKSUM; |
|
if (FFABS(pkt->pts - nus->last_pts) > nus->max_pts_distance) |
|
flags |= FLAG_CHECKSUM; |
|
if (pkt->size < nut->header_len[fc->header_idx] || |
|
(pkt->size > 4096 && fc->header_idx) || |
|
memcmp(pkt->data, nut->header[fc->header_idx], |
|
nut->header_len[fc->header_idx])) |
|
flags |= FLAG_HEADER_IDX; |
|
|
|
return flags | (fc->flags & FLAG_CODED); |
|
} |
|
|
|
static int find_best_header_idx(NUTContext *nut, AVPacket *pkt) |
|
{ |
|
int i; |
|
int best_i = 0; |
|
int best_len = 0; |
|
|
|
if (pkt->size > 4096) |
|
return 0; |
|
|
|
for (i = 1; i < nut->header_count; i++) |
|
if (pkt->size >= nut->header_len[i] |
|
&& nut->header_len[i] > best_len |
|
&& !memcmp(pkt->data, nut->header[i], nut->header_len[i])) { |
|
best_i = i; |
|
best_len = nut->header_len[i]; |
|
} |
|
return best_i; |
|
} |
|
|
|
static int nut_write_packet(AVFormatContext *s, AVPacket *pkt) |
|
{ |
|
NUTContext *nut = s->priv_data; |
|
StreamContext *nus = &nut->stream[pkt->stream_index]; |
|
AVIOContext *bc = s->pb, *dyn_bc; |
|
FrameCode *fc; |
|
int64_t coded_pts; |
|
int best_length, frame_code, flags, needed_flags, i, header_idx, |
|
best_header_idx; |
|
int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY); |
|
int store_sp = 0; |
|
int ret; |
|
|
|
if (pkt->pts < 0) { |
|
av_log(s, AV_LOG_ERROR, |
|
"Negative pts not supported stream %d, pts %"PRId64"\n", |
|
pkt->stream_index, pkt->pts); |
|
return AVERROR_INVALIDDATA; |
|
} |
|
|
|
if (1LL << (20 + 3 * nut->header_count) <= avio_tell(bc)) |
|
write_headers(s, bc); |
|
|
|
if (key_frame && !(nus->last_flags & FLAG_KEY)) |
|
store_sp = 1; |
|
|
|
if (pkt->size + 30 /*FIXME check*/ + avio_tell(bc) >= |
|
nut->last_syncpoint_pos + nut->max_distance) |
|
store_sp = 1; |
|
|
|
//FIXME: Ensure store_sp is 1 in the first place. |
|
|
|
if (store_sp) { |
|
Syncpoint *sp, dummy = { .pos = INT64_MAX }; |
|
|
|
ff_nut_reset_ts(nut, *nus->time_base, pkt->dts); |
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st = s->streams[i]; |
|
int64_t dts_tb = av_rescale_rnd(pkt->dts, |
|
nus->time_base->num * (int64_t)nut->stream[i].time_base->den, |
|
nus->time_base->den * (int64_t)nut->stream[i].time_base->num, |
|
AV_ROUND_DOWN); |
|
int index = av_index_search_timestamp(st, dts_tb, |
|
AVSEEK_FLAG_BACKWARD); |
|
if (index >= 0) |
|
dummy.pos = FFMIN(dummy.pos, st->index_entries[index].pos); |
|
} |
|
if (dummy.pos == INT64_MAX) |
|
dummy.pos = 0; |
|
sp = av_tree_find(nut->syncpoints, &dummy, (void *)ff_nut_sp_pos_cmp, |
|
NULL); |
|
|
|
nut->last_syncpoint_pos = avio_tell(bc); |
|
ret = avio_open_dyn_buf(&dyn_bc); |
|
if (ret < 0) |
|
return ret; |
|
put_tt(nut, nus->time_base, dyn_bc, pkt->dts); |
|
ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos) >> 4 : 0); |
|
put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE); |
|
|
|
ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts); |
|
} |
|
assert(nus->last_pts != AV_NOPTS_VALUE); |
|
|
|
coded_pts = pkt->pts & ((1 << nus->msb_pts_shift) - 1); |
|
if (ff_lsb2full(nus, coded_pts) != pkt->pts) |
|
coded_pts = pkt->pts + (1 << nus->msb_pts_shift); |
|
|
|
best_header_idx = find_best_header_idx(nut, pkt); |
|
|
|
best_length = INT_MAX; |
|
frame_code = -1; |
|
for (i = 0; i < 256; i++) { |
|
int length = 0; |
|
FrameCode *fc = &nut->frame_code[i]; |
|
int flags = fc->flags; |
|
|
|
if (flags & FLAG_INVALID) |
|
continue; |
|
needed_flags = get_needed_flags(nut, nus, fc, pkt); |
|
|
|
if (flags & FLAG_CODED) { |
|
length++; |
|
flags = needed_flags; |
|
} |
|
|
|
if ((flags & needed_flags) != needed_flags) |
|
continue; |
|
|
|
if ((flags ^ needed_flags) & FLAG_KEY) |
|
continue; |
|
|
|
if (flags & FLAG_STREAM_ID) |
|
length += ff_get_v_length(pkt->stream_index); |
|
|
|
if (pkt->size % fc->size_mul != fc->size_lsb) |
|
continue; |
|
if (flags & FLAG_SIZE_MSB) |
|
length += ff_get_v_length(pkt->size / fc->size_mul); |
|
|
|
if (flags & FLAG_CHECKSUM) |
|
length += 4; |
|
|
|
if (flags & FLAG_CODED_PTS) |
|
length += ff_get_v_length(coded_pts); |
|
|
|
if ((flags & FLAG_CODED) |
|
&& nut->header_len[best_header_idx] > |
|
nut->header_len[fc->header_idx] + 1) { |
|
flags |= FLAG_HEADER_IDX; |
|
} |
|
|
|
if (flags & FLAG_HEADER_IDX) { |
|
length += 1 - nut->header_len[best_header_idx]; |
|
} else { |
|
length -= nut->header_len[fc->header_idx]; |
|
} |
|
|
|
length *= 4; |
|
length += !(flags & FLAG_CODED_PTS); |
|
length += !(flags & FLAG_CHECKSUM); |
|
|
|
if (length < best_length) { |
|
best_length = length; |
|
frame_code = i; |
|
} |
|
} |
|
assert(frame_code != -1); |
|
fc = &nut->frame_code[frame_code]; |
|
flags = fc->flags; |
|
needed_flags = get_needed_flags(nut, nus, fc, pkt); |
|
header_idx = fc->header_idx; |
|
|
|
ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); |
|
avio_w8(bc, frame_code); |
|
if (flags & FLAG_CODED) { |
|
ff_put_v(bc, (flags ^ needed_flags) & ~(FLAG_CODED)); |
|
flags = needed_flags; |
|
} |
|
if (flags & FLAG_STREAM_ID) |
|
ff_put_v(bc, pkt->stream_index); |
|
if (flags & FLAG_CODED_PTS) |
|
ff_put_v(bc, coded_pts); |
|
if (flags & FLAG_SIZE_MSB) |
|
ff_put_v(bc, pkt->size / fc->size_mul); |
|
if (flags & FLAG_HEADER_IDX) |
|
ff_put_v(bc, header_idx = best_header_idx); |
|
|
|
if (flags & FLAG_CHECKSUM) |
|
avio_wl32(bc, ffio_get_checksum(bc)); |
|
else |
|
ffio_get_checksum(bc); |
|
|
|
avio_write(bc, pkt->data + nut->header_len[header_idx], |
|
pkt->size - nut->header_len[header_idx]); |
|
nus->last_flags = flags; |
|
nus->last_pts = pkt->pts; |
|
|
|
//FIXME just store one per syncpoint |
|
if (flags & FLAG_KEY) |
|
av_add_index_entry( |
|
s->streams[pkt->stream_index], |
|
nut->last_syncpoint_pos, |
|
pkt->pts, |
|
0, |
|
0, |
|
AVINDEX_KEYFRAME); |
|
|
|
return 0; |
|
} |
|
|
|
static int nut_write_trailer(AVFormatContext *s) |
|
{ |
|
NUTContext *nut = s->priv_data; |
|
AVIOContext *bc = s->pb; |
|
|
|
while (nut->header_count < 3) |
|
write_headers(s, bc); |
|
|
|
ff_nut_free_sp(nut); |
|
av_freep(&nut->stream); |
|
av_freep(&nut->chapter); |
|
av_freep(&nut->time_base); |
|
|
|
return 0; |
|
} |
|
|
|
AVOutputFormat ff_nut_muxer = { |
|
.name = "nut", |
|
.long_name = NULL_IF_CONFIG_SMALL("NUT"), |
|
.mime_type = "video/x-nut", |
|
.extensions = "nut", |
|
.priv_data_size = sizeof(NUTContext), |
|
.audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS : |
|
CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2, |
|
.video_codec = AV_CODEC_ID_MPEG4, |
|
.write_header = nut_write_header, |
|
.write_packet = nut_write_packet, |
|
.write_trailer = nut_write_trailer, |
|
.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS, |
|
.codec_tag = ff_nut_codec_tags, |
|
};
|
|
|