avformat/flvenc: add add_keyframe_index option
Add keyframe index metadata
Used to facilitate seeking; particularly for HTTP pseudo streaming.
1. read live streaming or file by sequence
2. if use add_keyframe_index option, add a mark flag at the position,
use to insert new context at the last step.
3. add the keyframes *offset* and *timestamp* into a list
4. if use add_keyframe_index option, shift the metadata data from
mark flag offset
5. insert the keyframes *offset* and *timestamp* from the list by
sequence
6. free the list
7. end.
Add FATE test case;
Reviewed-by: Lou Logan <lou@lrcd.com>
Signed-off-by: Steven Liu <liuqi@gosun.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Steven Liu
parent
2bc66d9e43
commit
863ebe6f83
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@ -147,6 +147,9 @@ Place AAC sequence header based on audio stream data.
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@item no_sequence_end
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Disable sequence end tag.
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@item add_keyframe_index
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Used to facilitate seeking; particularly for HTTP pseudo streaming.
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@end table
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@end table
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@ -24,6 +24,8 @@
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#include "libavutil/intfloat.h"
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#include "libavutil/avassert.h"
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#include "libavutil/mathematics.h"
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#include "avio_internal.h"
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#include "avio.h"
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#include "avc.h"
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#include "avformat.h"
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#include "flv.h"
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@ -64,8 +66,15 @@ static const AVCodecTag flv_audio_codec_ids[] = {
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typedef enum {
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FLV_AAC_SEQ_HEADER_DETECT = (1 << 0),
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FLV_NO_SEQUENCE_END = (1 << 1),
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FLV_ADD_KEYFRAME_INDEX = (1 << 2),
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} FLVFlags;
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typedef struct FLVFileposition {
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int64_t keyframe_position;
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double keyframe_timestamp;
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struct FLVFileposition *next;
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} FLVFileposition;
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typedef struct FLVContext {
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AVClass *av_class;
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int reserved;
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@ -74,6 +83,33 @@ typedef struct FLVContext {
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int64_t duration;
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int64_t delay; ///< first dts delay (needed for AVC & Speex)
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int64_t datastart_offset;
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int64_t datasize_offset;
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int64_t datasize;
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int64_t videosize_offset;
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int64_t videosize;
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int64_t audiosize_offset;
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int64_t audiosize;
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int64_t metadata_size_pos;
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int64_t metadata_totalsize_pos;
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int64_t metadata_totalsize;
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int64_t keyframe_index_size;
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int64_t lasttimestamp_offset;
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double lasttimestamp;
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int64_t lastkeyframetimestamp_offset;
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double lastkeyframetimestamp;
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int64_t lastkeyframelocation_offset;
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int64_t lastkeyframelocation;
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int acurframeindex;
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int64_t keyframes_info_offset;
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int64_t filepositions_count;
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FLVFileposition *filepositions;
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FLVFileposition *head_filepositions;
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AVCodecParameters *audio_par;
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AVCodecParameters *video_par;
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double framerate;
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@ -211,6 +247,17 @@ static void put_amf_double(AVIOContext *pb, double d)
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avio_wb64(pb, av_double2int(d));
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}
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static void put_amf_byte(AVIOContext *pb, unsigned char abyte)
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{
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avio_w8(pb, abyte);
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}
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static void put_amf_dword_array(AVIOContext *pb, uint32_t dw)
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{
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avio_w8(pb, AMF_DATA_TYPE_ARRAY);
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avio_wb32(pb, dw);
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}
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static void put_amf_bool(AVIOContext *pb, int b)
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{
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avio_w8(pb, AMF_DATA_TYPE_BOOL);
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@ -222,12 +269,12 @@ static void write_metadata(AVFormatContext *s, unsigned int ts)
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AVIOContext *pb = s->pb;
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FLVContext *flv = s->priv_data;
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int metadata_count = 0;
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int64_t metadata_size_pos, data_size, metadata_count_pos;
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int64_t metadata_count_pos;
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AVDictionaryEntry *tag = NULL;
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/* write meta_tag */
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avio_w8(pb, 18); // tag type META
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metadata_size_pos = avio_tell(pb);
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avio_w8(pb, FLV_TAG_TYPE_META); // tag type META
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flv->metadata_size_pos = avio_tell(pb);
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avio_wb24(pb, 0); // size of data part (sum of all parts below)
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avio_wb24(pb, ts); // timestamp
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avio_wb32(pb, 0); // reserved
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@ -336,19 +383,87 @@ static void write_metadata(AVFormatContext *s, unsigned int ts)
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put_amf_double(pb, 0); // delayed write
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}
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if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
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flv->acurframeindex = 0;
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flv->keyframe_index_size = 0;
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put_amf_string(pb, "hasVideo");
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put_amf_bool(pb, !!flv->video_par);
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metadata_count++;
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put_amf_string(pb, "hasKeyframes");
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put_amf_bool(pb, 1);
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metadata_count++;
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put_amf_string(pb, "hasAudio");
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put_amf_bool(pb, !!flv->audio_par);
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metadata_count++;
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put_amf_string(pb, "hasMetadata");
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put_amf_bool(pb, 1);
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metadata_count++;
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put_amf_string(pb, "canSeekToEnd");
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put_amf_bool(pb, 1);
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metadata_count++;
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put_amf_string(pb, "datasize");
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flv->datasize_offset = avio_tell(pb);
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flv->datasize = 0;
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put_amf_double(pb, flv->datasize);
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metadata_count++;
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put_amf_string(pb, "videosize");
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flv->videosize_offset = avio_tell(pb);
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flv->videosize = 0;
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put_amf_double(pb, flv->videosize);
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metadata_count++;
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put_amf_string(pb, "audiosize");
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flv->audiosize_offset = avio_tell(pb);
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flv->audiosize = 0;
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put_amf_double(pb, flv->audiosize);
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metadata_count++;
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put_amf_string(pb, "lasttimestamp");
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flv->lasttimestamp_offset = avio_tell(pb);
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flv->lasttimestamp = 0;
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put_amf_double(pb, 0);
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metadata_count++;
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put_amf_string(pb, "lastkeyframetimestamp");
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flv->lastkeyframetimestamp_offset = avio_tell(pb);
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flv->lastkeyframetimestamp = 0;
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put_amf_double(pb, 0);
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metadata_count++;
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put_amf_string(pb, "lastkeyframelocation");
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flv->lastkeyframelocation_offset = avio_tell(pb);
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flv->lastkeyframelocation = 0;
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put_amf_double(pb, 0);
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metadata_count++;
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put_amf_string(pb, "keyframes");
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put_amf_byte(pb, AMF_DATA_TYPE_OBJECT);
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metadata_count++;
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flv->keyframes_info_offset = avio_tell(pb);
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}
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put_amf_string(pb, "");
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avio_w8(pb, AMF_END_OF_OBJECT);
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/* write total size of tag */
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data_size = avio_tell(pb) - metadata_size_pos - 10;
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flv->metadata_totalsize = avio_tell(pb) - flv->metadata_size_pos - 10;
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avio_seek(pb, metadata_count_pos, SEEK_SET);
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avio_wb32(pb, metadata_count);
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avio_seek(pb, metadata_size_pos, SEEK_SET);
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avio_wb24(pb, data_size);
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avio_skip(pb, data_size + 10 - 3);
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avio_wb32(pb, data_size + 11);
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avio_seek(pb, flv->metadata_size_pos, SEEK_SET);
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avio_wb24(pb, flv->metadata_totalsize);
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avio_skip(pb, flv->metadata_totalsize + 10 - 3);
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flv->metadata_totalsize_pos = avio_tell(pb);
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avio_wb32(pb, flv->metadata_totalsize + 11);
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}
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static int unsupported_codec(AVFormatContext *s,
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@ -425,6 +540,111 @@ static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par) {
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}
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}
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static int flv_append_keyframe_info(AVFormatContext *s, FLVContext *flv, double ts, int64_t pos)
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{
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FLVFileposition *position = av_malloc(sizeof(FLVFileposition));
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if (!position) {
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av_log(s, AV_LOG_WARNING, "no mem for add keyframe index!\n");
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return AVERROR(ENOMEM);
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}
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position->keyframe_timestamp = ts;
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position->keyframe_position = pos;
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if (!flv->filepositions_count) {
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flv->filepositions = position;
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flv->head_filepositions = flv->filepositions;
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position->next = NULL;
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} else {
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flv->filepositions->next = position;
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position->next = NULL;
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flv->filepositions = flv->filepositions->next;
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}
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flv->filepositions_count++;
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return 0;
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}
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static int shift_data(AVFormatContext *s)
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{
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int ret = 0;
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int n = 0;
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int64_t metadata_size = 0;
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FLVContext *flv = s->priv_data;
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int64_t pos, pos_end = avio_tell(s->pb);
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uint8_t *buf, *read_buf[2];
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int read_buf_id = 0;
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int read_size[2];
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AVIOContext *read_pb;
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metadata_size = flv->filepositions_count * 9 * 2 + 10; /* filepositions and times value */
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metadata_size += 2 + 13; /* filepositions String */
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metadata_size += 2 + 5; /* times String */
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metadata_size += 3; /* Object end */
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flv->keyframe_index_size = metadata_size;
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if (metadata_size < 0)
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return metadata_size;
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buf = av_malloc_array(metadata_size, 2);
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if (!buf) {
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return AVERROR(ENOMEM);
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}
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read_buf[0] = buf;
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read_buf[1] = buf + metadata_size;
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avio_seek(s->pb, flv->metadata_size_pos, SEEK_SET);
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avio_wb24(s->pb, flv->metadata_totalsize + metadata_size);
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avio_seek(s->pb, flv->metadata_totalsize_pos, SEEK_SET);
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avio_wb32(s->pb, flv->metadata_totalsize + 11 + metadata_size);
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avio_seek(s->pb, pos_end, SEEK_SET);
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/* Shift the data: the AVIO context of the output can only be used for
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* writing, so we re-open the same output, but for reading. It also avoids
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* a read/seek/write/seek back and forth. */
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avio_flush(s->pb);
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ret = s->io_open(s, &read_pb, s->filename, AVIO_FLAG_READ, NULL);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Unable to re-open %s output file for "
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"the second pass (add_keyframe_index)\n", s->filename);
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goto end;
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}
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/* mark the end of the shift to up to the last data we wrote, and get ready
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* for writing */
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pos_end = avio_tell(s->pb);
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avio_seek(s->pb, flv->keyframes_info_offset + metadata_size, SEEK_SET);
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/* start reading at where the keyframe index information will be placed */
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avio_seek(read_pb, flv->keyframes_info_offset, SEEK_SET);
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pos = avio_tell(read_pb);
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/* shift data by chunk of at most keyframe *filepositions* and *times* size */
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read_size[read_buf_id] = avio_read(read_pb, read_buf[read_buf_id], metadata_size); \
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read_buf_id ^= 1;
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do {
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read_size[read_buf_id] = avio_read(read_pb, read_buf[read_buf_id], metadata_size); \
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read_buf_id ^= 1;
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n = read_size[read_buf_id];
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if (n < 0)
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break;
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avio_write(s->pb, read_buf[read_buf_id], n);
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pos += n;
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} while (pos <= pos_end);
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ff_format_io_close(s, &read_pb);
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end:
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av_free(buf);
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return ret;
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}
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static int flv_write_header(AVFormatContext *s)
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{
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int i;
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@ -530,17 +750,75 @@ static int flv_write_header(AVFormatContext *s)
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flv_write_codec_header(s, s->streams[i]->codecpar);
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}
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flv->datastart_offset = avio_tell(pb);
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return 0;
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}
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static int flv_write_trailer(AVFormatContext *s)
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{
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int64_t file_size;
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AVIOContext *pb = s->pb;
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FLVContext *flv = s->priv_data;
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int i;
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int build_keyframes_idx = flv->flags & FLV_ADD_KEYFRAME_INDEX;
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int i, res;
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int64_t cur_pos = avio_tell(s->pb);
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if (build_keyframes_idx) {
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FLVFileposition *newflv_posinfo, *p;
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avio_seek(pb, flv->videosize_offset, SEEK_SET);
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put_amf_double(pb, flv->videosize);
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avio_seek(pb, flv->audiosize_offset, SEEK_SET);
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put_amf_double(pb, flv->audiosize);
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avio_seek(pb, flv->lasttimestamp_offset, SEEK_SET);
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put_amf_double(pb, flv->lasttimestamp);
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avio_seek(pb, flv->lastkeyframetimestamp_offset, SEEK_SET);
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put_amf_double(pb, flv->lastkeyframetimestamp);
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avio_seek(pb, flv->lastkeyframelocation_offset, SEEK_SET);
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put_amf_double(pb, flv->lastkeyframelocation + flv->keyframe_index_size);
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avio_seek(pb, cur_pos, SEEK_SET);
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res = shift_data(s);
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if (res < 0) {
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goto end;
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}
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avio_seek(pb, flv->keyframes_info_offset, SEEK_SET);
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put_amf_string(pb, "filepositions");
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put_amf_dword_array(pb, flv->filepositions_count);
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for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
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put_amf_double(pb, newflv_posinfo->keyframe_position + flv->keyframe_index_size);
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}
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put_amf_string(pb, "times");
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put_amf_dword_array(pb, flv->filepositions_count);
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for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
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put_amf_double(pb, newflv_posinfo->keyframe_timestamp);
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}
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newflv_posinfo = flv->head_filepositions;
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while (newflv_posinfo) {
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p = newflv_posinfo->next;
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if (p) {
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newflv_posinfo->next = p->next;
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av_free(p);
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p = NULL;
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} else {
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av_free(newflv_posinfo);
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newflv_posinfo = NULL;
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}
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}
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put_amf_string(pb, "");
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avio_w8(pb, AMF_END_OF_OBJECT);
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avio_seek(pb, cur_pos + flv->keyframe_index_size, SEEK_SET);
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}
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end:
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if (flv->flags & FLV_NO_SEQUENCE_END) {
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av_log(s, AV_LOG_DEBUG, "FLV no sequence end mode open\n");
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} else {
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@ -556,6 +834,11 @@ static int flv_write_trailer(AVFormatContext *s)
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file_size = avio_tell(pb);
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if (build_keyframes_idx) {
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flv->datasize = file_size - flv->datastart_offset;
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avio_seek(pb, flv->datasize_offset, SEEK_SET);
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put_amf_double(pb, flv->datasize);
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}
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if (pb->seekable) {
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/* update information */
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if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0) {
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@ -583,6 +866,7 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
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int size = pkt->size;
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uint8_t *data = NULL;
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int flags = -1, flags_size, ret;
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int64_t cur_offset = avio_tell(pb);
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if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
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par->codec_id == AV_CODEC_ID_VP6 || par->codec_id == AV_CODEC_ID_AAC)
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@ -736,6 +1020,32 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
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pkt->pts + flv->delay + pkt->duration);
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}
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if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
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switch (par->codec_type) {
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case AVMEDIA_TYPE_VIDEO:
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flv->videosize += (avio_tell(pb) - cur_offset);
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flv->lasttimestamp = flv->acurframeindex / flv->framerate;
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if (pkt->flags & AV_PKT_FLAG_KEY) {
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double ts = flv->acurframeindex / flv->framerate;
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int64_t pos = cur_offset;
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flv->lastkeyframetimestamp = flv->acurframeindex / flv->framerate;
|
||||
flv->lastkeyframelocation = pos;
|
||||
flv_append_keyframe_info(s, flv, ts, pos);
|
||||
}
|
||||
flv->acurframeindex++;
|
||||
break;
|
||||
|
||||
case AVMEDIA_TYPE_AUDIO:
|
||||
flv->audiosize += (avio_tell(pb) - cur_offset);
|
||||
break;
|
||||
|
||||
default:
|
||||
av_log(s, AV_LOG_WARNING, "par->codec_type is type = [%d]\n", par->codec_type);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
av_free(data);
|
||||
|
||||
return pb->error;
|
||||
|
|
@ -745,6 +1055,7 @@ static const AVOption options[] = {
|
|||
{ "flvflags", "FLV muxer flags", offsetof(FLVContext, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
|
||||
{ "aac_seq_header_detect", "Put AAC sequence header based on stream data", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_AAC_SEQ_HEADER_DETECT}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
|
||||
{ "no_sequence_end", "disable sequence end for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_SEQUENCE_END}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
|
||||
{ "add_keyframe_index", "Add keyframe index metadata", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_ADD_KEYFRAME_INDEX}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
|
||||
{ NULL },
|
||||
};
|
||||
|
||||
|
|
|
|||
|
|
@ -132,6 +132,7 @@ include $(SRC_PATH)/tests/fate/fifo-muxer.mak
|
|||
include $(SRC_PATH)/tests/fate/filter-audio.mak
|
||||
include $(SRC_PATH)/tests/fate/filter-video.mak
|
||||
include $(SRC_PATH)/tests/fate/flac.mak
|
||||
include $(SRC_PATH)/tests/fate/flvenc.mak
|
||||
include $(SRC_PATH)/tests/fate/gapless.mak
|
||||
include $(SRC_PATH)/tests/fate/gif.mak
|
||||
include $(SRC_PATH)/tests/fate/h264.mak
|
||||
|
|
|
|||
|
|
@ -129,6 +129,10 @@ framecrc(){
|
|||
ffmpeg "$@" -flags +bitexact -fflags +bitexact -f framecrc -
|
||||
}
|
||||
|
||||
ffmetadata(){
|
||||
ffmpeg "$@" -flags +bitexact -fflags +bitexact -f ffmetadata -
|
||||
}
|
||||
|
||||
framemd5(){
|
||||
ffmpeg "$@" -flags +bitexact -fflags +bitexact -f framemd5 -
|
||||
}
|
||||
|
|
|
|||
11
tests/fate/flvenc.mak
Normal file
11
tests/fate/flvenc.mak
Normal file
|
|
@ -0,0 +1,11 @@
|
|||
tests/data/add_keyframe_index.flv: TAG = GEN
|
||||
tests/data/add_keyframe_index.flv: ffmpeg$(PROGSSUF)$(EXESUF) | tests/data
|
||||
$(M)$(TARGET_EXEC) $(TARGET_PATH)/$< \
|
||||
-f lavfi -i "sws_flags=+accurate_rnd+bitexact;testsrc=r=7:n=2:d=20" -sws_flags '+accurate_rnd+bitexact' -metadata "encoder=Lavf" -pix_fmt yuv420p -c:v flv1 -g 7 -f flv -flags +bitexact \
|
||||
-flvflags add_keyframe_index -idct simple -dct int -y $(TARGET_PATH)/tests/data/add_keyframe_index.flv 2> /dev/null;
|
||||
|
||||
FATE_AFILTER-$(call ALLYES, FLV_MUXER FLV_DEMUXER AVDEVICE TESTSRC_FILTER LAVFI_INDEV FLV_ENCODER) += fate-flv-add_keyframe_index
|
||||
fate-flv-add_keyframe_index: tests/data/add_keyframe_index.flv
|
||||
fate-flv-add_keyframe_index: CMD = ffmetadata -flags +bitexact -i $(TARGET_PATH)/tests/data/add_keyframe_index.flv
|
||||
|
||||
|
||||
12
tests/ref/fate/flv-add_keyframe_index
Normal file
12
tests/ref/fate/flv-add_keyframe_index
Normal file
|
|
@ -0,0 +1,12 @@
|
|||
;FFMETADATA1
|
||||
hasVideo=true
|
||||
hasKeyframes=true
|
||||
hasAudio=false
|
||||
hasMetadata=true
|
||||
canSeekToEnd=true
|
||||
datasize=629776
|
||||
videosize=629381
|
||||
audiosize=0
|
||||
lasttimestamp=20
|
||||
lastkeyframetimestamp=19
|
||||
lastkeyframelocation=597963
|
||||
Loading…
Reference in New Issue
Block a user