X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fmatroskaenc.c;h=6f45f446c0ef20ca422890198723b4d513baadfd;hb=446263879b96f03cffe486e97b14b4e28a61f6ab;hp=acb527c66d266ddd82a3b65c0cbc0ba9e94cd172;hpb=56d55a3bcf023acc7f24ec3bbb19017ee14e038b;p=ffmpeg diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c index acb527c66d2..6f45f446c0e 100644 --- a/libavformat/matroskaenc.c +++ b/libavformat/matroskaenc.c @@ -1,5 +1,5 @@ /* - * Matroska file muxer + * Matroska muxer * Copyright (c) 2007 David Conrad * * This file is part of FFmpeg. @@ -20,62 +20,146 @@ */ #include "avformat.h" +#include "md5.h" #include "riff.h" #include "xiph.h" #include "matroska.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 { - offset_t segment; - offset_t cluster; - uint64_t cluster_pts; - offset_t duration_offset; - uint64_t duration; + 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) { - if (id >= 0x3fffff) - put_byte(pb, id >> 24); - if (id >= 0x7fff) - put_byte(pb, id >> 16); - if (id >= 0xff) - put_byte(pb, id >> 8); - put_byte(pb, id); + int i = ebml_id_size(id); + while (i--) + put_byte(pb, id >> (i*8)); } -// XXX: test this thoroughly and get rid of minbytes hack (currently needed to -// use up all of the space reserved in start_ebml_master) -static void put_ebml_size(ByteIOContext *pb, uint64_t size, int minbytes) +/** + * 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) { - int bytes = minbytes; + assert(bytes <= 8); + put_byte(pb, 0x1ff >> bytes); + while (--bytes) + put_byte(pb, 0xff); +} - // sizes larger than this are currently undefined in EBML - // so write "unknown" size - size = FFMIN(size, (1ULL<<56)-1); +/** + * 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; +} - while (size >> (bytes*7 + 7)) 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); - put_byte(pb, (0x80 >> bytes) | (size >> bytes*8)); - for (bytes -= 1; bytes >= 0; bytes--) - put_byte(pb, size >> bytes*8); + // 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 bytes = 1; + int i, bytes = 1; while (val >> bytes*8) bytes++; put_ebml_id(pb, elementid); - put_ebml_size(pb, bytes, 0); - for (bytes -= 1; bytes >= 0; bytes--) - put_byte(pb, val >> bytes*8); + 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) { - // XXX: single-precision floats? put_ebml_id(pb, elementid); - put_ebml_size(pb, 8, 0); + put_ebml_num(pb, 8, 0); put_be64(pb, av_dbl2int(val)); } @@ -83,7 +167,7 @@ static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid, const uint8_t *buf, int size) { put_ebml_id(pb, elementid); - put_ebml_size(pb, size, 0); + put_ebml_num(pb, size, 0); put_buffer(pb, buf, size); } @@ -92,49 +176,222 @@ static void put_ebml_string(ByteIOContext *pb, unsigned int elementid, const cha put_ebml_binary(pb, elementid, str, strlen(str)); } -// this reserves exactly the amount of space specified by size, which must be at least 2 +/** + * 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); - if (size < 2) - return; + 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 + // 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_size(pb, size-1, 0); + put_ebml_num(pb, size-1, 0); else - put_ebml_size(pb, size-9, 7); + put_ebml_num(pb, size-9, 8); url_fseek(pb, currentpos + size, SEEK_SET); } -static offset_t start_ebml_master(ByteIOContext *pb, unsigned int elementid) +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); - // XXX: this always reserves the maximum needed space to store any size value - // we should be smarter (additional parameter for expected size?) - put_ebml_size(pb, (1ULL<<56)-1, 0); // largest unknown size - return url_ftell(pb); + put_ebml_size_unknown(pb, bytes); + return (ebml_master){ url_ftell(pb), bytes }; } -static void end_ebml_master(ByteIOContext *pb, offset_t start) +static void end_ebml_master(ByteIOContext *pb, ebml_master master) { offset_t pos = url_ftell(pb); - url_fseek(pb, start - 8, SEEK_SET); - put_ebml_size(pb, pos - start, 7); + // 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 int put_xiph_codecpriv(ByteIOContext *pb, AVCodecContext *codec) +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) { - offset_t codecprivate; uint8_t *header_start[3]; int header_len[3]; int first_header_size; - int j, k; + int j; if (codec->codec_id == CODEC_ID_VORBIS) first_header_size = 30; @@ -143,73 +400,151 @@ static int put_xiph_codecpriv(ByteIOContext *pb, AVCodecContext *codec) if (ff_split_xiph_headers(codec->extradata, codec->extradata_size, first_header_size, header_start, header_len) < 0) { - av_log(codec, AV_LOG_ERROR, "Extradata corrupt.\n"); + av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n"); return -1; } - codecprivate = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE); put_byte(pb, 2); // number packets - 1 for (j = 0; j < 2; j++) { - for (k = 0; k < header_len[j] / 255; k++) - put_byte(pb, 255); - put_byte(pb, header_len[j] % 255); + put_xiph_size(pb, header_len[j]); } for (j = 0; j < 3; j++) put_buffer(pb, header_start[j], header_len[j]); - end_ebml_master(pb, codecprivate); + + return 0; } -static int mkv_write_header(AVFormatContext *s) +#define FLAC_STREAMINFO_SIZE 34 + +static int put_flac_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec) { - MatroskaMuxContext *mkv = s->priv_data; - ByteIOContext *pb = &s->pb; - offset_t ebml_header, segment_info, tracks; - int i, j, k; + // 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; +} - ebml_header = start_ebml_master(pb, EBML_ID_HEADER); - 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); +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; + } - mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT); + 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]; + } +} - segment_info = start_ebml_master(pb, MATROSKA_ID_INFO); - 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); - // XXX: both are required; something better for writing app? - put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT); +static int mkv_write_codecprivate(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec, int native_id) +{ + ByteIOContext dyn_cp; + uint8_t *codecpriv; + int ret = 0, codecpriv_size; + + url_open_dyn_buf(&dyn_cp); + + 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->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); } - // XXX: segment UID - // 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); - tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS); + 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; - offset_t subinfo, track; + 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); - track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY); + 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 + // 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); @@ -218,91 +553,208 @@ static int mkv_write_header(AVFormatContext *s) } } - // XXX: CodecPrivate for vorbis, theora, aac, native mpeg4, ... - if (native_id) { - if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA) { - if (put_xiph_codecpriv(pb, codec) < 0) - return -1; - } else { - put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codec->extradata, codec->extradata_size); - } - } - switch (codec->codec_type) { case CODEC_TYPE_VIDEO: put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO); - if (!native_id) { - offset_t bmp_header; - // if there is no mkv-specific codec id, use VFW mode - if (!codec->codec_tag) - codec->codec_tag = codec_get_tag(codec_bmp_tags, codec->codec_id); - + 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); - // XXX: codec private isn't a master; is there a better way to re-use put_bmp_header? - bmp_header = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE); - put_bmp_header(pb, codec, codec_bmp_tags, 0); - end_ebml_master(pb, bmp_header); - } - subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO); + + 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); - // XXX: display width/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); - // XXX: A_MS/ACM - subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO); + 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, codec->sample_rate); - // XXX: output sample freq (for sbr) and bitdepth (for pcm) + 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 and video are supported for Matroska."); + 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); - mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER); + 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; - offset_t block; + 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 + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) { + 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); - mkv->cluster = start_ebml_master(pb, MATROSKA_ID_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)); } - block = start_ebml_master(pb, MATROSKA_ID_SIMPLEBLOCK); - 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, !!(pkt->flags & PKT_FLAG_KEY)); - put_buffer(pb, pkt->data, pkt->size); - end_ebml_master(pb, block); + 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 = pkt->pts + pkt->duration; + mkv->duration = FFMAX(mkv->duration, pkt->pts + pkt->duration); return 0; } @@ -310,17 +762,39 @@ static int mkv_write_trailer(AVFormatContext *s) { MatroskaMuxContext *mkv = s->priv_data; ByteIOContext *pb = &s->pb; - offset_t currentpos; + offset_t currentpos, second_seekhead, cuespos; + int ret; end_ebml_master(pb, mkv->cluster); - // update the duration - currentpos = url_ftell(pb); - url_fseek(pb, mkv->duration_offset, SEEK_SET); - put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration); - url_fseek(pb, currentpos, SEEK_SET); + 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; } @@ -336,4 +810,19 @@ AVOutputFormat matroska_muxer = { 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}, };