#include "avc.h"
#include "flacenc.h"
#include "libavutil/intreadwrite.h"
-#include "libavutil/md5.h"
+#include "libavutil/random_seed.h"
+#include "libavutil/lfg.h"
#include "libavcodec/xiph.h"
#include "libavcodec/mpeg4audio.h"
int write_dts;
} mkv_track;
+#define MODE_MATROSKAv2 0x01
+#define MODE_WEBM 0x02
+
typedef struct MatroskaMuxContext {
+ int mode;
ByteIOContext *dyn_bc;
ebml_master segment;
int64_t segment_offset;
- int64_t segment_uid;
ebml_master cluster;
int64_t cluster_pos; ///< file offset of the current cluster
int64_t cluster_pts;
int64_t duration_offset;
int64_t duration;
mkv_seekhead *main_seekhead;
- mkv_seekhead *cluster_seekhead;
mkv_cues *cues;
mkv_track *tracks;
- struct AVMD5 *md5_ctx;
+ unsigned int audio_buffer_size;
+ AVPacket cur_audio_pkt;
} MatroskaMuxContext;
}
static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid,
- const uint8_t *buf, int size)
+ const void *buf, int size)
{
put_ebml_id(pb, elementid);
put_ebml_num(pb, size, 0);
}
}
+ if (mkv->mode == MODE_WEBM && !(codec->codec_id == CODEC_ID_VP8 ||
+ codec->codec_id == CODEC_ID_VORBIS)) {
+ av_log(s, AV_LOG_ERROR,
+ "Only VP8 video and Vorbis audio are supported for WebM.\n");
+ return AVERROR(EINVAL);
+ }
+
switch (codec->codec_type) {
case AVMEDIA_TYPE_VIDEO:
put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
ByteIOContext *pb = s->pb;
ebml_master ebml_header, segment_info;
AVMetadataTag *tag;
- int ret;
+ int ret, i;
+
+ if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
+ else mkv->mode = MODE_MATROSKAv2;
- mkv->md5_ctx = av_mallocz(av_md5_size);
- av_md5_init(mkv->md5_ctx);
mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
+ if (!mkv->tracks)
+ return AVERROR(ENOMEM);
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_string (pb, EBML_ID_DOCTYPE , s->oformat->name);
put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
end_ebml_master(pb, ebml_header);
// 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)
+ if (!mkv->main_seekhead)
return AVERROR(ENOMEM);
ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb));
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)) {
+ uint32_t segment_uid[4];
+ AVLFG lfg;
+
+ av_lfg_init(&lfg, av_get_random_seed());
+
+ for (i = 0; i < 4; i++)
+ segment_uid[i] = av_lfg_get(&lfg);
+
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);
+ put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
}
// reserve space for the duration
ret = mkv_write_tracks(s);
if (ret < 0) return ret;
- ret = mkv_write_chapters(s);
- if (ret < 0) return ret;
+ if (mkv->mode != MODE_WEBM) {
+ ret = mkv_write_chapters(s);
+ if (ret < 0) return ret;
+ }
if (url_is_streamed(s->pb))
mkv_write_seekhead(pb, mkv->main_seekhead);
if (mkv->cues == NULL)
return AVERROR(ENOMEM);
+ av_init_packet(&mkv->cur_audio_pkt);
+ mkv->cur_audio_pkt.size = 0;
+ mkv->audio_buffer_size = 0;
+
put_flush_packet(pb);
return 0;
}
mkv->dyn_bc = NULL;
}
-static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
+static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = s->pb;
}
if (!mkv->cluster_pos) {
- ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
- if (ret < 0) return ret;
-
mkv->cluster_pos = url_ftell(s->pb);
mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
mkv->cluster_pts = FFMAX(0, ts);
- av_md5_update(mkv->md5_ctx, pkt->data, FFMIN(200, pkt->size));
}
if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
if (ret < 0) return ret;
}
- // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming
- if ((url_is_streamed(s->pb) && (url_ftell(pb) > 32*1024 || ts > mkv->cluster_pts + 1000))
- || url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || ts > mkv->cluster_pts + 5000) {
+ mkv->duration = FFMAX(mkv->duration, ts + duration);
+ return 0;
+}
+
+static int mkv_copy_packet(MatroskaMuxContext *mkv, const AVPacket *pkt)
+{
+ uint8_t *data = mkv->cur_audio_pkt.data;
+ mkv->cur_audio_pkt = *pkt;
+ mkv->cur_audio_pkt.data = av_fast_realloc(data, &mkv->audio_buffer_size, pkt->size);
+ if (!mkv->cur_audio_pkt.data)
+ return AVERROR(ENOMEM);
+
+ memcpy(mkv->cur_audio_pkt.data, pkt->data, pkt->size);
+ mkv->cur_audio_pkt.size = pkt->size;
+ return 0;
+}
+
+static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ MatroskaMuxContext *mkv = s->priv_data;
+ ByteIOContext *pb = url_is_streamed(s->pb) ? mkv->dyn_bc : s->pb;
+ AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
+ int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
+ int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
+ int cluster_size = url_ftell(pb) - (url_is_streamed(s->pb) ? 0 : mkv->cluster_pos);
+
+ // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
+ // after 4k and on a keyframe
+ if (mkv->cluster_pos &&
+ ((url_is_streamed(s->pb) && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
+ || cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
+ || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
" bytes, pts %" PRIu64 "\n", url_ftell(pb), ts);
end_ebml_master(pb, mkv->cluster);
mkv_flush_dynbuf(s);
}
- mkv->duration = FFMAX(mkv->duration, ts + duration);
- return 0;
+ // check if we have an audio packet cached
+ if (mkv->cur_audio_pkt.size > 0) {
+ ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
+ mkv->cur_audio_pkt.size = 0;
+ if (ret < 0) {
+ av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
+ return ret;
+ }
+ }
+
+ // buffer an audio packet to ensure the packet containing the video
+ // keyframe's timecode is contained in the same cluster for WebM
+ if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
+ ret = mkv_copy_packet(mkv, pkt);
+ else
+ ret = mkv_write_packet_internal(s, pkt);
+ return ret;
}
static int mkv_write_trailer(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
ByteIOContext *pb = s->pb;
- int64_t currentpos, second_seekhead, cuespos;
+ int64_t currentpos, cuespos;
int ret;
+ // check if we have an audio packet cached
+ if (mkv->cur_audio_pkt.size > 0) {
+ ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
+ mkv->cur_audio_pkt.size = 0;
+ if (ret < 0) {
+ av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
+ return ret;
+ }
+ }
+
if (mkv->dyn_bc) {
end_ebml_master(mkv->dyn_bc, mkv->cluster);
mkv_flush_dynbuf(s);
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;
- if (second_seekhead >= 0) {
- 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
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);
av_free(mkv->tracks);
+ av_destruct_packet(&mkv->cur_audio_pkt);
put_flush_packet(pb);
return 0;
}
+#if CONFIG_MATROSKA_MUXER
AVOutputFormat matroska_muxer = {
"matroska",
NULL_IF_CONFIG_SMALL("Matroska file format"),
.codec_tag = (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, 0},
.subtitle_codec = CODEC_ID_TEXT,
};
+#endif
+
+#if CONFIG_WEBM_MUXER
+AVOutputFormat webm_muxer = {
+ "webm",
+ NULL_IF_CONFIG_SMALL("WebM file format"),
+ "video/webm",
+ "webm",
+ sizeof(MatroskaMuxContext),
+ CODEC_ID_VORBIS,
+ CODEC_ID_VP8,
+ mkv_write_header,
+ mkv_write_packet,
+ mkv_write_trailer,
+ .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
+};
+#endif
+#if CONFIG_MATROSKA_AUDIO_MUXER
AVOutputFormat matroska_audio_muxer = {
"matroska",
NULL_IF_CONFIG_SMALL("Matroska file format"),
.flags = AVFMT_GLOBALHEADER,
.codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
};
+#endif
projects / ffmpeg / blobdiff