[FFmpeg-devel] [PATCH] yuv4mpeg: add rough duration estimate and seeking.
Paul B Mahol
onemda at gmail.com
Sat Jul 11 12:59:58 CEST 2015
Dana 11. 7. 2015. 03:16 osoba "Ronald S. Bultje" <rsbultje at gmail.com>
napisala je:
>
> ---
> libavformat/yuv4mpeg.h | 1 +
> libavformat/yuv4mpegdec.c | 26 +++++++++++----
> tests/ref/seek/lavf-yuv4mpeg | 78
+++++++++++++++++++++++++++++---------------
> 3 files changed, 72 insertions(+), 33 deletions(-)
>
> diff --git a/libavformat/yuv4mpeg.h b/libavformat/yuv4mpeg.h
> index 750f498..eba7337 100644
> --- a/libavformat/yuv4mpeg.h
> +++ b/libavformat/yuv4mpeg.h
> @@ -23,5 +23,6 @@
>
> #define Y4M_MAGIC "YUV4MPEG2"
> #define Y4M_FRAME_MAGIC "FRAME"
> +#define Y4M_FRAME_MAGIC_LEN 6
>
> #endif /* AVFORMAT_YUV4MPEG_H */
> diff --git a/libavformat/yuv4mpegdec.c b/libavformat/yuv4mpegdec.c
> index 7613c3c..4ebdb78 100644
> --- a/libavformat/yuv4mpegdec.c
> +++ b/libavformat/yuv4mpegdec.c
> @@ -256,6 +256,12 @@ static int yuv4_read_header(AVFormatContext *s)
> st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
> st->codec->chroma_sample_location = chroma_sample_location;
> st->codec->field_order = field_order;
> + s->packet_size = avpicture_get_size(st->codec->pix_fmt, width,
height) + Y4M_FRAME_MAGIC_LEN;
> + if ((int) s->packet_size < 0)
> + return s->packet_size;
> + s->internal->data_offset = avio_tell(pb);
> +
> + st->duration = (avio_size(pb) - avio_tell(pb)) / s->packet_size;
>
> return 0;
> }
> @@ -264,7 +270,7 @@ static int yuv4_read_packet(AVFormatContext *s,
AVPacket *pkt)
> {
> int i;
> char header[MAX_FRAME_HEADER+1];
> - int packet_size, width, height, ret;
> + int width, height, ret, off = avio_tell(s->pb);
> AVStream *st = s->streams[0];
>
> for (i = 0; i < MAX_FRAME_HEADER; i++) {
> @@ -287,17 +293,22 @@ static int yuv4_read_packet(AVFormatContext *s,
AVPacket *pkt)
> width = st->codec->width;
> height = st->codec->height;
>
> - packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
> - if (packet_size < 0)
> - return packet_size;
> -
> - ret = av_get_packet(s->pb, pkt, packet_size);
> + ret = av_get_packet(s->pb, pkt, s->packet_size -
Y4M_FRAME_MAGIC_LEN);
> if (ret < 0)
> return ret;
> - else if (ret != packet_size)
> + else if (ret != s->packet_size - Y4M_FRAME_MAGIC_LEN)
> return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
>
> pkt->stream_index = 0;
> + pkt->pts = (off - s->internal->data_offset) / s->packet_size;
> + pkt->duration = 1;
> + return 0;
> +}
> +
> +static int yuv4_read_seek(AVFormatContext *s, int stream_index,
> + int64_t pts, int flags)
> +{
> + avio_seek(s->pb, pts * s->packet_size + s->internal->data_offset,
SEEK_SET);
> return 0;
> }
>
> @@ -316,5 +327,6 @@ AVInputFormat ff_yuv4mpegpipe_demuxer = {
> .read_probe = yuv4_probe,
> .read_header = yuv4_read_header,
> .read_packet = yuv4_read_packet,
> + .read_seek = yuv4_read_seek,
> .extensions = "y4m",
> };
> diff --git a/tests/ref/seek/lavf-yuv4mpeg b/tests/ref/seek/lavf-yuv4mpeg
> index 81c1de9..60c3036 100644
> --- a/tests/ref/seek/lavf-yuv4mpeg
> +++ b/tests/ref/seek/lavf-yuv4mpeg
> @@ -1,27 +1,53 @@
> ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 64
size:152064
> -ret:-1 st:-1 flags:0 ts:-1.000000
> -ret:-1 st:-1 flags:1 ts: 1.894167
> -ret:-1 st: 0 flags:0 ts: 0.800000
> -ret:-1 st: 0 flags:1 ts:-0.320000
> -ret:-1 st:-1 flags:0 ts: 2.576668
> -ret:-1 st:-1 flags:1 ts: 1.470835
> -ret:-1 st: 0 flags:0 ts: 0.360000
> -ret:-1 st: 0 flags:1 ts:-0.760000
> -ret:-1 st:-1 flags:0 ts: 2.153336
> -ret:-1 st:-1 flags:1 ts: 1.047503
> -ret:-1 st: 0 flags:0 ts:-0.040000
> -ret:-1 st: 0 flags:1 ts: 2.840000
> -ret:-1 st:-1 flags:0 ts: 1.730004
> -ret:-1 st:-1 flags:1 ts: 0.624171
> -ret:-1 st: 0 flags:0 ts:-0.480000
> -ret:-1 st: 0 flags:1 ts: 2.400000
> -ret:-1 st:-1 flags:0 ts: 1.306672
> -ret:-1 st:-1 flags:1 ts: 0.200839
> -ret:-1 st: 0 flags:0 ts:-0.920000
> -ret:-1 st: 0 flags:1 ts: 2.000000
> -ret:-1 st:-1 flags:0 ts: 0.883340
> -ret:-1 st:-1 flags:1 ts:-0.222493
> -ret:-1 st: 0 flags:0 ts: 2.680000
> -ret:-1 st: 0 flags:1 ts: 1.560000
> -ret:-1 st:-1 flags:0 ts: 0.460008
> -ret:-1 st:-1 flags:1 ts:-0.645825
> +ret: 0 st:-1 flags:0 ts:-1.000000
> +ret: 0 st: 0 flags:1 dts: 0.040000 pts: 0.040000 pos: 152134
size:152064
> +ret: 0 st:-1 flags:1 ts: 1.894167
> +ret:-EOF
> +ret: 0 st: 0 flags:0 ts: 0.800000
> +ret: 0 st: 0 flags:1 dts: 0.800000 pts: 0.800000 pos:3041464
size:152064
> +ret: 0 st: 0 flags:1 ts:-0.320000
> +ret: 0 st: 0 flags:1 dts: 0.840000 pts: 0.840000 pos:3193534
size:152064
> +ret: 0 st:-1 flags:0 ts: 2.576668
> +ret:-EOF
> +ret: 0 st:-1 flags:1 ts: 1.470835
> +ret:-EOF
> +ret: 0 st: 0 flags:0 ts: 0.360000
> +ret: 0 st: 0 flags:1 dts: 0.360000 pts: 0.360000 pos:1368694
size:152064
> +ret: 0 st: 0 flags:1 ts:-0.760000
> +ret: 0 st: 0 flags:1 dts: 0.400000 pts: 0.400000 pos:1520764
size:152064
> +ret: 0 st:-1 flags:0 ts: 2.153336
> +ret:-EOF
> +ret: 0 st:-1 flags:1 ts: 1.047503
> +ret:-EOF
> +ret: 0 st: 0 flags:0 ts:-0.040000
> +ret:-EOF
> +ret: 0 st: 0 flags:1 ts: 2.840000
> +ret:-EOF
> +ret: 0 st:-1 flags:0 ts: 1.730004
> +ret:-EOF
> +ret: 0 st:-1 flags:1 ts: 0.624171
> +ret: 0 st: 0 flags:1 dts: 0.640000 pts: 0.640000 pos:2433184
size:152064
> +ret: 0 st: 0 flags:0 ts:-0.480000
> +ret: 0 st: 0 flags:1 dts: 0.680000 pts: 0.680000 pos:2585254
size:152064
> +ret: 0 st: 0 flags:1 ts: 2.400000
> +ret:-EOF
> +ret: 0 st:-1 flags:0 ts: 1.306672
> +ret:-EOF
> +ret: 0 st:-1 flags:1 ts: 0.200839
> +ret: 0 st: 0 flags:1 dts: 0.200000 pts: 0.200000 pos: 760414
size:152064
> +ret: 0 st: 0 flags:0 ts:-0.920000
> +ret: 0 st: 0 flags:1 dts: 0.240000 pts: 0.240000 pos: 912484
size:152064
> +ret: 0 st: 0 flags:1 ts: 2.000000
> +ret:-EOF
> +ret: 0 st:-1 flags:0 ts: 0.883340
> +ret: 0 st: 0 flags:1 dts: 0.880000 pts: 0.880000 pos:3345604
size:152064
> +ret: 0 st:-1 flags:1 ts:-0.222493
> +ret: 0 st: 0 flags:1 dts: 0.920000 pts: 0.920000 pos:3497674
size:152064
> +ret: 0 st: 0 flags:0 ts: 2.680000
> +ret:-EOF
> +ret: 0 st: 0 flags:1 ts: 1.560000
> +ret:-EOF
> +ret: 0 st:-1 flags:0 ts: 0.460008
> +ret: 0 st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos:1824904
size:152064
> +ret: 0 st:-1 flags:1 ts:-0.645825
> +ret: 0 st: 0 flags:1 dts: 0.520000 pts: 0.520000 pos:1976974
size:152064
> --
> 2.1.2
>
>
Probably ok.
_______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
More information about the ffmpeg-devel
mailing list