| /* |
| * 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 "riff.h" |
| #include "isom.h" |
| #include "matroska.h" |
| #include "avc.h" |
| #include "flacenc.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/md5.h" |
| #include "libavcodec/xiph.h" |
| #include "libavcodec/mpeg4audio.h" |
| |
| typedef struct ebml_master { |
| int64_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 { |
| int64_t filepos; |
| int64_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; |
| int64_t cluster_pos; ///< file offset of the cluster containing the block |
| } mkv_cuepoint; |
| |
| typedef struct { |
| int64_t segment_offset; |
| mkv_cuepoint *entries; |
| int num_entries; |
| } mkv_cues; |
| |
| typedef struct MatroskaMuxContext { |
| ebml_master segment; |
| int64_t segment_offset; |
| int64_t segment_uid; |
| ebml_master cluster; |
| int64_t cluster_pos; ///< file offset of the current cluster |
| uint64_t cluster_pts; |
| int64_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) |
| { |
| int64_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) |
| { |
| int64_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, int64_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 int64_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead) |
| { |
| ebml_master metaseek, seekentry; |
| int64_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(int64_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, int64_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 int64_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues, int num_tracks) |
| { |
| ebml_master cues_element; |
| int64_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; |
| } |
| |
| static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate) |
| { |
| 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 = ff_mpeg4audio_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 = ff_mpeg4audio_sample_rates[sri]; |
| } |
| } |
| |
| static int mkv_write_codecprivate(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec, int native_id, int qt_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 = ff_flac_write_header(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 (qt_id) { |
| if (!codec->codec_tag) |
| codec->codec_tag = codec_get_tag(codec_movvideo_tags, codec->codec_id); |
| if (codec->extradata_size) |
| put_buffer(dyn_cp, codec->extradata, codec->extradata_size); |
| } else { |
| 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 qt_id = 0; |
| int bit_depth = av_get_bits_per_sample(codec->codec_id); |
| int sample_rate = codec->sample_rate; |
| int output_sample_rate = 0; |
| AVMetadataTag *tag; |
| |
| 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 ((tag = av_metadata_get(st->metadata, "description", NULL, 0))) |
| put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value); |
| tag = av_metadata_get(st->metadata, "language", NULL, 0); |
| put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und"); |
| |
| if (st->disposition) |
| put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT)); |
| |
| // 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 && |
| codec_get_tag(codec_movvideo_tags, codec->codec_id) && |
| (!codec_get_tag(codec_bmp_tags, codec->codec_id) |
| || codec->codec_id == CODEC_ID_SVQ1 |
| || codec->codec_id == CODEC_ID_SVQ3 |
| || codec->codec_id == CODEC_ID_CINEPAK)) |
| qt_id = 1; |
| |
| if (qt_id) |
| put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME"); |
| else if (!native_id) |
| // if there is no mkv-specific codec ID, use VFW mode |
| put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/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 (st->sample_aspect_ratio.num) { |
| int d_width = codec->width*av_q2d(st->sample_aspect_ratio); |
| put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width); |
| put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height); |
| } |
| 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, "A_MS/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, qt_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; |
| AVMetadataTag *tag; |
| 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 ((tag = av_metadata_get(s->metadata, "title", NULL, 0))) |
| put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value); |
| 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); |
| |
| put_flush_packet(pb); |
| return 0; |
| } |
| |
| static int mkv_blockgroup_size(int pkt_size) |
| { |
| int size = pkt_size + 4; |
| 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 int ass_get_duration(const uint8_t *p) |
| { |
| int sh, sm, ss, sc, eh, em, es, ec; |
| uint64_t start, end; |
| |
| if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d", |
| &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8) |
| return 0; |
| start = 3600000*sh + 60000*sm + 1000*ss + 10*sc; |
| end = 3600000*eh + 60000*em + 1000*es + 10*ec; |
| return end - start; |
| } |
| |
| static int mkv_write_ass_blocks(AVFormatContext *s, AVPacket *pkt) |
| { |
| MatroskaMuxContext *mkv = s->priv_data; |
| ByteIOContext *pb = s->pb; |
| int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size; |
| uint8_t *start, *end, *data = pkt->data; |
| ebml_master blockgroup; |
| char buffer[2048]; |
| |
| while (data_size) { |
| int duration = ass_get_duration(data); |
| max_duration = FFMAX(duration, max_duration); |
| end = memchr(data, '\n', data_size); |
| size = line_size = end ? end-data+1 : data_size; |
| size -= end ? (end[-1]=='\r')+1 : 0; |
| start = data; |
| for (i=0; i<3; i++, start++) |
| if (!(start = memchr(start, ',', size-(start-data)))) |
| return max_duration; |
| size -= start - data; |
| sscanf(data, "Dialogue: %d,", &layer); |
| i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,", |
| s->streams[pkt->stream_index]->nb_frames++, layer); |
| size = FFMIN(i+size, sizeof(buffer)); |
| memcpy(buffer+i, start, size-i); |
| |
| av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, " |
| "pts %" PRId64 ", duration %d\n", |
| url_ftell(pb), size, pkt->pts, duration); |
| blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size)); |
| put_ebml_id(pb, MATROSKA_ID_BLOCK); |
| put_ebml_num(pb, size+4, 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, 0); |
| put_buffer(pb, buffer, size); |
| put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration); |
| end_ebml_master(pb, blockgroup); |
| |
| data += line_size; |
| data_size -= line_size; |
| } |
| |
| return max_duration; |
| } |
| |
| static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags) |
| { |
| MatroskaMuxContext *mkv = s->priv_data; |
| ByteIOContext *pb = s->pb; |
| AVCodecContext *codec = s->streams[pkt->stream_index]->codec; |
| uint8_t *data = NULL; |
| int size = pkt->size; |
| |
| 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); |
| if (codec->codec_id == CODEC_ID_H264 && codec->extradata_size > 0 && |
| (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1)) |
| ff_avc_parse_nal_units_buf(pkt->data, &data, &size); |
| else |
| data = pkt->data; |
| put_ebml_id(pb, blockid); |
| put_ebml_num(pb, size+4, 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, data, size); |
| if (data != pkt->data) |
| av_free(data); |
| } |
| |
| 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 duration = pkt->duration; |
| 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_type != CODEC_TYPE_SUBTITLE) { |
| mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7); |
| } else if (codec->codec_id == CODEC_ID_SSA) { |
| duration = mkv_write_ass_blocks(s, pkt); |
| } else { |
| ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size)); |
| duration = pkt->convergence_duration; |
| mkv_write_block(s, MATROSKA_ID_BLOCK, pkt, 0); |
| put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, 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 + duration); |
| return 0; |
| } |
| |
| static int mkv_write_trailer(AVFormatContext *s) |
| { |
| MatroskaMuxContext *mkv = s->priv_data; |
| ByteIOContext *pb = s->pb; |
| int64_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); |
| put_flush_packet(pb); |
| return 0; |
| } |
| |
| AVOutputFormat matroska_muxer = { |
| "matroska", |
| NULL_IF_CONFIG_SMALL("Matroska file format"), |
| "video/x-matroska", |
| "mkv", |
| sizeof(MatroskaMuxContext), |
| CODEC_ID_MP2, |
| CODEC_ID_MPEG4, |
| mkv_write_header, |
| mkv_write_packet, |
| mkv_write_trailer, |
| .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS, |
| .codec_tag = (const AVCodecTag* const []){codec_bmp_tags, codec_wav_tags, 0}, |
| .subtitle_codec = CODEC_ID_TEXT, |
| }; |
| |
| AVOutputFormat matroska_audio_muxer = { |
| "matroska", |
| NULL_IF_CONFIG_SMALL("Matroska file format"), |
| "audio/x-matroska", |
| "mka", |
| sizeof(MatroskaMuxContext), |
| CODEC_ID_MP2, |
| CODEC_ID_NONE, |
| mkv_write_header, |
| mkv_write_packet, |
| mkv_write_trailer, |
| .flags = AVFMT_GLOBALHEADER, |
| .codec_tag = (const AVCodecTag* const []){codec_wav_tags, 0}, |
| }; |
