diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/matroskaenc.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/matroskaenc.c | 845 |
1 files changed, 0 insertions, 845 deletions
diff --git a/contrib/ffmpeg/libavformat/matroskaenc.c b/contrib/ffmpeg/libavformat/matroskaenc.c deleted file mode 100644 index d096f7204..000000000 --- a/contrib/ffmpeg/libavformat/matroskaenc.c +++ /dev/null @@ -1,845 +0,0 @@ -/* - * Matroska muxer - * Copyright (c) 2007 David Conrad - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include "avformat.h" -#include "md5.h" -#include "riff.h" -#include "xiph.h" -#include "matroska.h" -#include "avc.h" - -typedef struct ebml_master { - offset_t pos; ///< absolute offset in the file where the master's elements start - int sizebytes; ///< how many bytes were reserved for the size -} ebml_master; - -typedef struct mkv_seekhead_entry { - unsigned int elementid; - uint64_t segmentpos; -} mkv_seekhead_entry; - -typedef struct mkv_seekhead { - offset_t filepos; - offset_t segment_offset; ///< the file offset to the beginning of the segment - int reserved_size; ///< -1 if appending to file - int max_entries; - mkv_seekhead_entry *entries; - int num_entries; -} mkv_seekhead; - -typedef struct { - uint64_t pts; - int tracknum; - offset_t cluster_pos; ///< file offset of the cluster containing the block -} mkv_cuepoint; - -typedef struct { - offset_t segment_offset; - mkv_cuepoint *entries; - int num_entries; -} mkv_cues; - -typedef struct MatroskaMuxContext { - ebml_master segment; - offset_t segment_offset; - offset_t segment_uid; - ebml_master cluster; - offset_t cluster_pos; ///< file offset of the current cluster - uint64_t cluster_pts; - offset_t duration_offset; - uint64_t duration; - mkv_seekhead *main_seekhead; - mkv_seekhead *cluster_seekhead; - mkv_cues *cues; - - struct AVMD5 *md5_ctx; -} MatroskaMuxContext; - - -/** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit - * offset, 4 bytes for target EBML ID */ -#define MAX_SEEKENTRY_SIZE 21 - -/** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2 - * 8-byte uint max */ -#define MAX_CUETRACKPOS_SIZE 22 - -/** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */ -#define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks - - -static int ebml_id_size(unsigned int id) -{ - return (av_log2(id+1)-1)/7+1; -} - -static void put_ebml_id(ByteIOContext *pb, unsigned int id) -{ - int i = ebml_id_size(id); - while (i--) - put_byte(pb, id >> (i*8)); -} - -/** - * Write an EBML size meaning "unknown size". - * - * @param bytes The number of bytes the size should occupy (maximum: 8). - */ -static void put_ebml_size_unknown(ByteIOContext *pb, int bytes) -{ - assert(bytes <= 8); - put_byte(pb, 0x1ff >> bytes); - while (--bytes) - put_byte(pb, 0xff); -} - -/** - * Calculate how many bytes are needed to represent a given number in EBML. - */ -static int ebml_num_size(uint64_t num) -{ - int bytes = 1; - while ((num+1) >> bytes*7) bytes++; - return bytes; -} - -/** - * Write a number in EBML variable length format. - * - * @param bytes The number of bytes that need to be used to write the number. - * If zero, any number of bytes can be used. - */ -static void put_ebml_num(ByteIOContext *pb, uint64_t num, int bytes) -{ - int i, needed_bytes = ebml_num_size(num); - - // sizes larger than this are currently undefined in EBML - assert(num < (1ULL<<56)-1); - - if (bytes == 0) - // don't care how many bytes are used, so use the min - bytes = needed_bytes; - // the bytes needed to write the given size would exceed the bytes - // that we need to use, so write unknown size. This shouldn't happen. - assert(bytes >= needed_bytes); - - num |= 1ULL << bytes*7; - for (i = bytes - 1; i >= 0; i--) - put_byte(pb, num >> i*8); -} - -static void put_ebml_uint(ByteIOContext *pb, unsigned int elementid, uint64_t val) -{ - int i, bytes = 1; - uint64_t tmp = val; - while (tmp>>=8) bytes++; - - put_ebml_id(pb, elementid); - put_ebml_num(pb, bytes, 0); - for (i = bytes - 1; i >= 0; i--) - put_byte(pb, val >> i*8); -} - -static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val) -{ - put_ebml_id(pb, elementid); - put_ebml_num(pb, 8, 0); - put_be64(pb, av_dbl2int(val)); -} - -static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid, - const uint8_t *buf, int size) -{ - put_ebml_id(pb, elementid); - put_ebml_num(pb, size, 0); - put_buffer(pb, buf, size); -} - -static void put_ebml_string(ByteIOContext *pb, unsigned int elementid, const char *str) -{ - put_ebml_binary(pb, elementid, str, strlen(str)); -} - -/** - * Writes a void element of a given size. Useful for reserving space in - * the file to be written to later. - * - * @param size The number of bytes to reserve, which must be at least 2. - */ -static void put_ebml_void(ByteIOContext *pb, uint64_t size) -{ - offset_t currentpos = url_ftell(pb); - - assert(size >= 2); - - put_ebml_id(pb, EBML_ID_VOID); - // we need to subtract the length needed to store the size from the - // size we need to reserve so 2 cases, we use 8 bytes to store the - // size if possible, 1 byte otherwise - if (size < 10) - put_ebml_num(pb, size-1, 0); - else - put_ebml_num(pb, size-9, 8); - while(url_ftell(pb) < currentpos + size) - put_byte(pb, 0); -} - -static ebml_master start_ebml_master(ByteIOContext *pb, unsigned int elementid, uint64_t expectedsize) -{ - int bytes = expectedsize ? ebml_num_size(expectedsize) : 8; - put_ebml_id(pb, elementid); - put_ebml_size_unknown(pb, bytes); - return (ebml_master){ url_ftell(pb), bytes }; -} - -static void end_ebml_master(ByteIOContext *pb, ebml_master master) -{ - offset_t pos = url_ftell(pb); - - // leave the unknown size for masters when streaming - if (url_is_streamed(pb)) - return; - - url_fseek(pb, master.pos - master.sizebytes, SEEK_SET); - put_ebml_num(pb, pos - master.pos, master.sizebytes); - url_fseek(pb, pos, SEEK_SET); -} - -static void put_xiph_size(ByteIOContext *pb, int size) -{ - int i; - for (i = 0; i < size / 255; i++) - put_byte(pb, 255); - put_byte(pb, size % 255); -} - -/** - * Initialize a mkv_seekhead element to be ready to index level 1 Matroska - * elements. If a maximum number of elements is specified, enough space - * will be reserved at the current file location to write a seek head of - * that size. - * - * @param segment_offset The absolute offset to the position in the file - * where the segment begins. - * @param numelements The maximum number of elements that will be indexed - * by this seek head, 0 if unlimited. - */ -static mkv_seekhead * mkv_start_seekhead(ByteIOContext *pb, offset_t segment_offset, int numelements) -{ - mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead)); - if (new_seekhead == NULL) - return NULL; - - new_seekhead->segment_offset = segment_offset; - - if (numelements > 0) { - new_seekhead->filepos = url_ftell(pb); - // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID - // and size, and 3 bytes to guarantee that an EBML void element - // will fit afterwards - new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13; - new_seekhead->max_entries = numelements; - put_ebml_void(pb, new_seekhead->reserved_size); - } - return new_seekhead; -} - -static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos) -{ - mkv_seekhead_entry *entries = seekhead->entries; - - // don't store more elements than we reserved space for - if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries) - return -1; - - entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry)); - if (entries == NULL) - return AVERROR(ENOMEM); - - entries[seekhead->num_entries ].elementid = elementid; - entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset; - - seekhead->entries = entries; - return 0; -} - -/** - * Write the seek head to the file and free it. If a maximum number of - * elements was specified to mkv_start_seekhead(), the seek head will - * be written at the location reserved for it. Otherwise, it is written - * at the current location in the file. - * - * @return The file offset where the seekhead was written. - */ -static offset_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead) -{ - ebml_master metaseek, seekentry; - offset_t currentpos; - int i; - - currentpos = url_ftell(pb); - - if (seekhead->reserved_size > 0) - url_fseek(pb, seekhead->filepos, SEEK_SET); - - metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size); - for (i = 0; i < seekhead->num_entries; i++) { - mkv_seekhead_entry *entry = &seekhead->entries[i]; - - seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE); - - put_ebml_id(pb, MATROSKA_ID_SEEKID); - put_ebml_num(pb, ebml_id_size(entry->elementid), 0); - put_ebml_id(pb, entry->elementid); - - put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos); - end_ebml_master(pb, seekentry); - } - end_ebml_master(pb, metaseek); - - if (seekhead->reserved_size > 0) { - uint64_t remaining = seekhead->filepos + seekhead->reserved_size - url_ftell(pb); - put_ebml_void(pb, remaining); - url_fseek(pb, currentpos, SEEK_SET); - - currentpos = seekhead->filepos; - } - av_free(seekhead->entries); - av_free(seekhead); - - return currentpos; -} - -static mkv_cues * mkv_start_cues(offset_t segment_offset) -{ - mkv_cues *cues = av_mallocz(sizeof(mkv_cues)); - if (cues == NULL) - return NULL; - - cues->segment_offset = segment_offset; - return cues; -} - -static int mkv_add_cuepoint(mkv_cues *cues, AVPacket *pkt, offset_t cluster_pos) -{ - mkv_cuepoint *entries = cues->entries; - - entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint)); - if (entries == NULL) - return AVERROR(ENOMEM); - - entries[cues->num_entries ].pts = pkt->pts; - entries[cues->num_entries ].tracknum = pkt->stream_index + 1; - entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset; - - cues->entries = entries; - return 0; -} - -static offset_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues, int num_tracks) -{ - ebml_master cues_element; - offset_t currentpos; - int i, j; - - currentpos = url_ftell(pb); - cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0); - - for (i = 0; i < cues->num_entries; i++) { - ebml_master cuepoint, track_positions; - mkv_cuepoint *entry = &cues->entries[i]; - uint64_t pts = entry->pts; - - cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks)); - put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts); - - // put all the entries from different tracks that have the exact same - // timestamp into the same CuePoint - for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) { - track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE); - put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum ); - put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos); - end_ebml_master(pb, track_positions); - } - i += j - 1; - end_ebml_master(pb, cuepoint); - } - end_ebml_master(pb, cues_element); - - av_free(cues->entries); - av_free(cues); - return currentpos; -} - -static int put_xiph_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec) -{ - uint8_t *header_start[3]; - int header_len[3]; - int first_header_size; - int j; - - if (codec->codec_id == CODEC_ID_VORBIS) - first_header_size = 30; - else - first_header_size = 42; - - if (ff_split_xiph_headers(codec->extradata, codec->extradata_size, - first_header_size, header_start, header_len) < 0) { - av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n"); - return -1; - } - - put_byte(pb, 2); // number packets - 1 - for (j = 0; j < 2; j++) { - put_xiph_size(pb, header_len[j]); - } - for (j = 0; j < 3; j++) - put_buffer(pb, header_start[j], header_len[j]); - - return 0; -} - -#define FLAC_STREAMINFO_SIZE 34 - -static int put_flac_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec) -{ - // if the extradata_size is greater than FLAC_STREAMINFO_SIZE, - // assume that it's in Matroska's format already - if (codec->extradata_size < FLAC_STREAMINFO_SIZE) { - av_log(s, AV_LOG_ERROR, "Invalid FLAC extradata\n"); - return -1; - } else if (codec->extradata_size == FLAC_STREAMINFO_SIZE) { - // only the streaminfo packet - put_byte(pb, 0); - put_xiph_size(pb, codec->extradata_size); - av_log(s, AV_LOG_ERROR, "Only one packet\n"); - } - put_buffer(pb, codec->extradata, codec->extradata_size); - return 0; -} - -static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate) -{ - static const int aac_sample_rates[] = { - 96000, 88200, 64000, 48000, 44100, 32000, - 24000, 22050, 16000, 12000, 11025, 8000, - }; - int sri; - - if (codec->extradata_size < 2) { - av_log(s, AV_LOG_WARNING, "No AAC extradata, unable to determine samplerate.\n"); - return; - } - - sri = ((codec->extradata[0] << 1) & 0xE) | (codec->extradata[1] >> 7); - if (sri > 12) { - av_log(s, AV_LOG_WARNING, "AAC samplerate index out of bounds\n"); - return; - } - *sample_rate = aac_sample_rates[sri]; - - // if sbr, get output sample rate as well - if (codec->extradata_size == 5) { - sri = (codec->extradata[4] >> 3) & 0xF; - if (sri > 12) { - av_log(s, AV_LOG_WARNING, "AAC output samplerate index out of bounds\n"); - return; - } - *output_sample_rate = aac_sample_rates[sri]; - } -} - -static int mkv_write_codecprivate(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec, int native_id) -{ - ByteIOContext *dyn_cp; - uint8_t *codecpriv; - int ret, codecpriv_size; - - ret = url_open_dyn_buf(&dyn_cp); - if(ret < 0) - return ret; - - if (native_id) { - if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA) - ret = put_xiph_codecpriv(s, dyn_cp, codec); - else if (codec->codec_id == CODEC_ID_FLAC) - ret = put_flac_codecpriv(s, dyn_cp, codec); - else if (codec->codec_id == CODEC_ID_H264) - ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size); - else if (codec->extradata_size) - put_buffer(dyn_cp, codec->extradata, codec->extradata_size); - } else if (codec->codec_type == CODEC_TYPE_VIDEO) { - if (!codec->codec_tag) - codec->codec_tag = codec_get_tag(codec_bmp_tags, codec->codec_id); - if (!codec->codec_tag) { - av_log(s, AV_LOG_ERROR, "No bmp codec ID found."); - ret = -1; - } - - put_bmp_header(dyn_cp, codec, codec_bmp_tags, 0); - - } else if (codec->codec_type == CODEC_TYPE_AUDIO) { - if (!codec->codec_tag) - codec->codec_tag = codec_get_tag(codec_wav_tags, codec->codec_id); - if (!codec->codec_tag) { - av_log(s, AV_LOG_ERROR, "No wav codec ID found."); - ret = -1; - } - - put_wav_header(dyn_cp, codec); - } - - codecpriv_size = url_close_dyn_buf(dyn_cp, &codecpriv); - if (codecpriv_size) - put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size); - av_free(codecpriv); - return ret; -} - -static int mkv_write_tracks(AVFormatContext *s) -{ - MatroskaMuxContext *mkv = s->priv_data; - ByteIOContext *pb = s->pb; - ebml_master tracks; - int i, j, ret; - - ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, url_ftell(pb)); - if (ret < 0) return ret; - - tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0); - for (i = 0; i < s->nb_streams; i++) { - AVStream *st = s->streams[i]; - AVCodecContext *codec = st->codec; - ebml_master subinfo, track; - int native_id = 0; - int bit_depth = av_get_bits_per_sample(codec->codec_id); - int sample_rate = codec->sample_rate; - int output_sample_rate = 0; - - if (!bit_depth) - bit_depth = av_get_bits_per_sample_format(codec->sample_fmt); - - if (codec->codec_id == CODEC_ID_AAC) - get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate); - - track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0); - put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1); - put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1); - put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet) - - if (st->language[0]) - put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, st->language); - else - put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, "und"); - - // look for a codec ID string specific to mkv to use, - // if none are found, use AVI codes - for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) { - if (ff_mkv_codec_tags[j].id == codec->codec_id) { - put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str); - native_id = 1; - break; - } - } - - switch (codec->codec_type) { - case CODEC_TYPE_VIDEO: - put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO); - - if (!native_id) - // if there is no mkv-specific codec ID, use VFW mode - put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC); - - subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0); - // XXX: interlace flag? - put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width); - put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height); - if (codec->sample_aspect_ratio.num) { - AVRational dar = av_mul_q(codec->sample_aspect_ratio, - (AVRational){codec->width, codec->height}); - put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , dar.num); - put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, dar.den); - } - end_ebml_master(pb, subinfo); - break; - - case CODEC_TYPE_AUDIO: - put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO); - - if (!native_id) - // no mkv-specific ID, use ACM mode - put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_AUDIO_ACM); - - subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0); - put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels); - put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate); - if (output_sample_rate) - put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate); - if (bit_depth) - put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth); - end_ebml_master(pb, subinfo); - break; - - case CODEC_TYPE_SUBTITLE: - put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE); - break; - default: - av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska."); - break; - } - ret = mkv_write_codecprivate(s, pb, codec, native_id); - if (ret < 0) return ret; - - end_ebml_master(pb, track); - - // ms precision is the de-facto standard timescale for mkv files - av_set_pts_info(st, 64, 1, 1000); - } - end_ebml_master(pb, tracks); - return 0; -} - -static int mkv_write_header(AVFormatContext *s) -{ - MatroskaMuxContext *mkv = s->priv_data; - ByteIOContext *pb = s->pb; - ebml_master ebml_header, segment_info; - int ret; - - mkv->md5_ctx = av_mallocz(av_md5_size); - av_md5_init(mkv->md5_ctx); - - ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0); - put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1); - put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1); - put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4); - put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8); - put_ebml_string (pb, EBML_ID_DOCTYPE , "matroska"); - put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2); - put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2); - end_ebml_master(pb, ebml_header); - - mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0); - mkv->segment_offset = url_ftell(pb); - - // we write 2 seek heads - one at the end of the file to point to each - // cluster, and one at the beginning to point to all other level one - // elements (including the seek head at the end of the file), which - // isn't more than 10 elements if we only write one of each other - // currently defined level 1 element - mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10); - mkv->cluster_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 0); - if (mkv->main_seekhead == NULL || mkv->cluster_seekhead == NULL) - return AVERROR(ENOMEM); - - ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb)); - if (ret < 0) return ret; - - segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0); - put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000); - if (strlen(s->title)) - put_ebml_string(pb, MATROSKA_ID_TITLE, s->title); - if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) { - put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT); - put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT); - - // reserve space to write the segment UID later - mkv->segment_uid = url_ftell(pb); - put_ebml_void(pb, 19); - } - - // reserve space for the duration - mkv->duration = 0; - mkv->duration_offset = url_ftell(pb); - put_ebml_void(pb, 11); // assumes double-precision float to be written - end_ebml_master(pb, segment_info); - - ret = mkv_write_tracks(s); - if (ret < 0) return ret; - - ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb)); - if (ret < 0) return ret; - - mkv->cluster_pos = url_ftell(pb); - mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0); - put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, 0); - mkv->cluster_pts = 0; - - mkv->cues = mkv_start_cues(mkv->segment_offset); - if (mkv->cues == NULL) - return AVERROR(ENOMEM); - - return 0; -} - -static int mkv_block_size(AVPacket *pkt) -{ - int size = 4; // track num + timecode + flags - return size + pkt->size; -} - -static int mkv_blockgroup_size(AVPacket *pkt) -{ - int size = mkv_block_size(pkt); - size += ebml_num_size(size); - size += 2; // EBML ID for block and block duration - size += 8; // max size of block duration - size += ebml_num_size(size); - size += 1; // blockgroup EBML ID - return size; -} - -static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags) -{ - MatroskaMuxContext *mkv = s->priv_data; - ByteIOContext *pb = s->pb; - - av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, " - "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n", - url_ftell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags); - put_ebml_id(pb, blockid); - put_ebml_num(pb, mkv_block_size(pkt), 0); - put_byte(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126 - put_be16(pb, pkt->pts - mkv->cluster_pts); - put_byte(pb, flags); - put_buffer(pb, pkt->data, pkt->size); -} - -static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt) -{ - MatroskaMuxContext *mkv = s->priv_data; - ByteIOContext *pb = s->pb; - AVCodecContext *codec = s->streams[pkt->stream_index]->codec; - int keyframe = !!(pkt->flags & PKT_FLAG_KEY); - int ret; - - // start a new cluster every 5 MB or 5 sec - if (url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) { - av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64 - " bytes, pts %" PRIu64 "\n", url_ftell(pb), pkt->pts); - end_ebml_master(pb, mkv->cluster); - - ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb)); - if (ret < 0) return ret; - - mkv->cluster_pos = url_ftell(pb); - mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0); - put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts); - mkv->cluster_pts = pkt->pts; - av_md5_update(mkv->md5_ctx, pkt->data, FFMIN(200, pkt->size)); - } - - if (codec->codec_id == CODEC_ID_H264 && - codec->extradata_size > 0 && AV_RB32(codec->extradata) == 0x00000001) { - /* from x264 or from bytestream h264 */ - /* nal reformating needed */ - int ret = ff_avc_parse_nal_units(pkt->data, &pkt->data, &pkt->size); - if (ret < 0) - return ret; - assert(pkt->size); - } - - if (codec->codec_type != CODEC_TYPE_SUBTITLE) { - mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7); - } else { - ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt)); - mkv_write_block(s, MATROSKA_ID_BLOCK, pkt, 0); - put_ebml_uint(pb, MATROSKA_ID_DURATION, pkt->duration); - end_ebml_master(pb, blockgroup); - } - - if (codec->codec_type == CODEC_TYPE_VIDEO && keyframe) { - ret = mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos); - if (ret < 0) return ret; - } - - mkv->duration = FFMAX(mkv->duration, pkt->pts + pkt->duration); - return 0; -} - -static int mkv_write_trailer(AVFormatContext *s) -{ - MatroskaMuxContext *mkv = s->priv_data; - ByteIOContext *pb = s->pb; - offset_t currentpos, second_seekhead, cuespos; - int ret; - - end_ebml_master(pb, mkv->cluster); - - if (!url_is_streamed(pb)) { - cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams); - second_seekhead = mkv_write_seekhead(pb, mkv->cluster_seekhead); - - ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES , cuespos); - if (ret < 0) return ret; - ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead); - if (ret < 0) return ret; - mkv_write_seekhead(pb, mkv->main_seekhead); - - // update the duration - av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration); - currentpos = url_ftell(pb); - url_fseek(pb, mkv->duration_offset, SEEK_SET); - put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration); - - // write the md5sum of some frames as the segment UID - if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) { - uint8_t segment_uid[16]; - av_md5_final(mkv->md5_ctx, segment_uid); - url_fseek(pb, mkv->segment_uid, SEEK_SET); - put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16); - } - url_fseek(pb, currentpos, SEEK_SET); - } - - end_ebml_master(pb, mkv->segment); - av_free(mkv->md5_ctx); - return 0; -} - -AVOutputFormat matroska_muxer = { - "matroska", - "Matroska File Format", - "video/x-matroska", - "mkv", - sizeof(MatroskaMuxContext), - CODEC_ID_MP2, - CODEC_ID_MPEG4, - mkv_write_header, - mkv_write_packet, - mkv_write_trailer, - .codec_tag = (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0}, - .subtitle_codec = CODEC_ID_TEXT, -}; - -AVOutputFormat matroska_audio_muxer = { - "matroska", - "Matroska File Format", - "audio/x-matroska", - "mka", - sizeof(MatroskaMuxContext), - CODEC_ID_MP2, - CODEC_ID_NONE, - mkv_write_header, - mkv_write_packet, - mkv_write_trailer, - .codec_tag = (const AVCodecTag*[]){codec_wav_tags, 0}, -}; 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