[FFmpeg-devel] [PATCH v7 1/2] avformat: refactor ff_stream_encode_params_copy() to stream_params_copy()
Pierre-Anthony Lemieux
pal at sandflow.com
Mon Aug 8 17:50:23 EEST 2022
On Mon, Aug 8, 2022 at 7:48 AM Andreas Rheinhardt
<andreas.rheinhardt at outlook.com> wrote:
>
> pal at sandflow.com:
> > From: Pierre-Anthony Lemieux <pal at palemieux.com>
> >
> > Addresses http://ffmpeg.org/pipermail/ffmpeg-devel/2022-August/299726.html
> >
> > ---
> > libavformat/avformat.c | 66 ++++++++++++++++++++++++++++++++++++++++
> > libavformat/fifo.c | 8 ++---
> > libavformat/internal.h | 11 +++++++
> > libavformat/mux.h | 9 ------
> > libavformat/mux_utils.c | 28 -----------------
> > libavformat/segment.c | 6 ++--
> > libavformat/tee.c | 7 ++---
> > libavformat/webm_chunk.c | 6 ++--
> > 8 files changed, 86 insertions(+), 55 deletions(-)
> >
> > diff --git a/libavformat/avformat.c b/libavformat/avformat.c
> > index 30d6ea6a49..19c7219471 100644
> > --- a/libavformat/avformat.c
> > +++ b/libavformat/avformat.c
> > @@ -235,6 +235,72 @@ int ff_stream_side_data_copy(AVStream *dst, const AVStream *src)
> > return 0;
> > }
> >
> > +/**
> > + * Copy all stream parameters from source to destination stream, with the
> > + * exception of the index field, which is usually set by avformat_new_stream().
> > + *
> > + * @param dst pointer to destination AVStream
> > + * @param src pointer to source AVStream
> > + * @return >=0 on success, AVERROR code on error
> > + */
> > +static int stream_params_copy(AVStream *dst, const AVStream *src)
> > +{
> > + int ret;
> > +
> > + dst->id = src->id;
> > + dst->time_base = src->time_base;
> > + dst->start_time = src->start_time;
> > + dst->duration = src->duration;
> > + dst->nb_frames = src->nb_frames;
> > + dst->disposition = src->disposition;
> > + dst->discard = src->discard;
> > + dst->sample_aspect_ratio = src->sample_aspect_ratio;
> > + dst->avg_frame_rate = src->avg_frame_rate;
> > + dst->event_flags = src->event_flags;
> > + dst->r_frame_rate = src->r_frame_rate;
> > + dst->pts_wrap_bits = src->pts_wrap_bits;
> > +
> > + av_dict_free(&dst->metadata);
> > + ret = av_dict_copy(&dst->metadata, src->metadata, 0);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = ff_stream_side_data_copy(dst, src);
> > + if (ret < 0)
> > + return ret;
> > +
> > + av_packet_unref(&dst->attached_pic);
> > + if (src->attached_pic.data) {
> > + ret = av_packet_ref(&dst->attached_pic, &src->attached_pic);
> > + if (ret < 0)
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +AVStream *ff_stream_clone(AVFormatContext *dst_ctx, const AVStream *src)
> > +{
> > + AVStream *st;
> > + int ret;
> > +
> > + st = avformat_new_stream(dst_ctx, NULL);
> > + if (!st)
> > + return NULL;
> > +
> > + ret = stream_params_copy(st, src);
> > + if (ret < 0) {
> > + ff_remove_stream(dst_ctx, st);
> > + return NULL;
> > + }
> > +
> > + return st;
> > +}
> > +
> > AVProgram *av_new_program(AVFormatContext *ac, int id)
> > {
> > AVProgram *program = NULL;
> > diff --git a/libavformat/fifo.c b/libavformat/fifo.c
> > index ead2bdc5cf..55d413b952 100644
> > --- a/libavformat/fifo.c
> > +++ b/libavformat/fifo.c
> > @@ -505,13 +505,11 @@ static int fifo_mux_init(AVFormatContext *avf, const AVOutputFormat *oformat,
> > avf2->flags = avf->flags;
> >
> > for (i = 0; i < avf->nb_streams; ++i) {
> > - AVStream *st = avformat_new_stream(avf2, NULL);
> > + AVStream *st = NULL;
> > +
> > + st = ff_stream_clone(avf2, avf->streams[i]);
>
> I don't know why you stopped initializing st directly with its eventual
> value (if I see this corrently, the line wouldn't be overlong). I can
> fix this upon commit if you allow. Anyway, I will apply this in two days
> unless there are any comments from anyone else.
I thought if(<assignment>) was not favored.
Please modify as you see fit.
Thanks.
>
> > if (!st)
> > return AVERROR(ENOMEM);
> > -
> > - ret = ff_stream_encode_params_copy(st, avf->streams[i]);
> > - if (ret < 0)
> > - return ret;
> > }
> >
> > return 0;
> > diff --git a/libavformat/internal.h b/libavformat/internal.h
> > index b6b8fbf56f..9b07cfb271 100644
> > --- a/libavformat/internal.h
> > +++ b/libavformat/internal.h
> > @@ -625,6 +625,17 @@ enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
> > */
> > int ff_stream_side_data_copy(AVStream *dst, const AVStream *src);
> >
> > +/**
> > + * Create a new stream and copy to it all parameters from a source stream, with
> > + * the exception of the index field, which is set when the new stream is
> > + * created.
> > + *
> > + * @param dst_ctx pointer to the context in which the new stream is created
> > + * @param src pointer to source AVStream
> > + * @return pointer to the new stream or NULL on error
> > + */
> > +AVStream *ff_stream_clone(AVFormatContext *dst_ctx, const AVStream *src);
> > +
> > /**
> > * Wrap ffurl_move() and log if error happens.
> > *
> > diff --git a/libavformat/mux.h b/libavformat/mux.h
> > index c01da82194..1bfcaf795f 100644
> > --- a/libavformat/mux.h
> > +++ b/libavformat/mux.h
> > @@ -113,15 +113,6 @@ int ff_format_shift_data(AVFormatContext *s, int64_t read_start, int shift_size)
> > */
> > int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
> >
> > -/**
> > - * Copy encoding parameters from source to destination stream
> > - *
> > - * @param dst pointer to destination AVStream
> > - * @param src pointer to source AVStream
> > - * @return >=0 on success, AVERROR code on error
> > - */
> > -int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);
> > -
> > /**
> > * Parse creation_time in AVFormatContext metadata if exists and warn if the
> > * parsing fails.
> > diff --git a/libavformat/mux_utils.c b/libavformat/mux_utils.c
> > index eb8ea3d560..2fa2ab5b0f 100644
> > --- a/libavformat/mux_utils.c
> > +++ b/libavformat/mux_utils.c
> > @@ -121,34 +121,6 @@ int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **op
> > return 0;
> > }
> >
> > -int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src)
> > -{
> > - int ret;
> > -
> > - dst->id = src->id;
> > - dst->time_base = src->time_base;
> > - dst->nb_frames = src->nb_frames;
> > - dst->disposition = src->disposition;
> > - dst->sample_aspect_ratio = src->sample_aspect_ratio;
> > - dst->avg_frame_rate = src->avg_frame_rate;
> > - dst->r_frame_rate = src->r_frame_rate;
> > -
> > - av_dict_free(&dst->metadata);
> > - ret = av_dict_copy(&dst->metadata, src->metadata, 0);
> > - if (ret < 0)
> > - return ret;
> > -
> > - ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
> > - if (ret < 0)
> > - return ret;
> > -
> > - ret = ff_stream_side_data_copy(dst, src);
> > - if (ret < 0)
> > - return ret;
> > -
> > - return 0;
> > -}
> > -
> > int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds)
> > {
> > AVDictionaryEntry *entry;
> > diff --git a/libavformat/segment.c b/libavformat/segment.c
> > index fa435d9f32..c904e20708 100644
> > --- a/libavformat/segment.c
> > +++ b/libavformat/segment.c
> > @@ -167,11 +167,9 @@ static int segment_mux_init(AVFormatContext *s)
> > AVStream *st, *ist = s->streams[i];
> > AVCodecParameters *ipar = ist->codecpar, *opar;
> >
> > - if (!(st = avformat_new_stream(oc, NULL)))
> > + st = ff_stream_clone(oc, ist);
> > + if (!st)
> > return AVERROR(ENOMEM);
> > - ret = ff_stream_encode_params_copy(st, ist);
> > - if (ret < 0)
> > - return ret;
> > opar = st->codecpar;
> > if (!oc->oformat->codec_tag ||
> > av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
> > diff --git a/libavformat/tee.c b/libavformat/tee.c
> > index f1f2a9d2a5..dd408dd096 100644
> > --- a/libavformat/tee.c
> > +++ b/libavformat/tee.c
> > @@ -284,14 +284,11 @@ static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
> > }
> > tee_slave->stream_map[i] = stream_count++;
> >
> > - if (!(st2 = avformat_new_stream(avf2, NULL))) {
> > + st2 = ff_stream_clone(avf2, st);
> > + if (!st2) {
> > ret = AVERROR(ENOMEM);
> > goto end;
> > }
> > -
> > - ret = ff_stream_encode_params_copy(st2, st);
> > - if (ret < 0)
> > - goto end;
> > }
> >
> > ret = ff_format_output_open(avf2, filename, &options);
> > diff --git a/libavformat/webm_chunk.c b/libavformat/webm_chunk.c
> > index d69db3a004..9e71a1209d 100644
> > --- a/libavformat/webm_chunk.c
> > +++ b/libavformat/webm_chunk.c
> > @@ -91,12 +91,10 @@ static int webm_chunk_init(AVFormatContext *s)
> > if ((ret = av_dict_copy(&oc->metadata, s->metadata, 0)) < 0)
> > return ret;
> >
> > - if (!(st = avformat_new_stream(oc, NULL)))
> > + st = ff_stream_clone(oc, ost);
> > + if (!st)
> > return AVERROR(ENOMEM);
> >
> > - if ((ret = ff_stream_encode_params_copy(st, ost)) < 0)
> > - return ret;
> > -
> > if (wc->http_method)
> > if ((ret = av_dict_set(&dict, "method", wc->http_method, 0)) < 0)
> > return ret;
>
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