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buffersrc: switch to an AVOptions-based system.

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This commit is contained in:
Anton Khirnov 2013-02-25 21:21:29 +01:00
parent 4fa1f52e33
commit d28cb84989
2 changed files with 55 additions and 53 deletions
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39
doc/filters.texi
View File

@ -2195,46 +2195,35 @@ Buffer video frames, and make them available to the filter chain.
This source is mainly intended for a programmatic use, in particular
through the interface defined in @file{libavfilter/vsrc_buffer.h}.
It accepts the following parameters:
@var{width}:@var{height}:@var{pix_fmt_string}:@var{timebase_num}:@var{timebase_den}:@var{sample_aspect_ratio_num}:@var{sample_aspect_ratio.den}
All the parameters need to be explicitly defined.
Follows the list of the accepted parameters.
This filter accepts the following parameters:
@table @option
@item width, height
Specify the width and height of the buffered video frames.
@item width
Input video width.
@item pix_fmt_string
A string representing the pixel format of the buffered video frames.
It may be a number corresponding to a pixel format, or a pixel format
name.
@item height
Input video height.
@item timebase_num, timebase_den
Specify numerator and denomitor of the timebase assumed by the
timestamps of the buffered frames.
@item pix_fmt
Name of the input video pixel format.
@item time_base
The time base used for input timestamps.
@item sar
Sample (pixel) aspect ratio of the input video.
@item sample_aspect_ratio.num, sample_aspect_ratio.den
Specify numerator and denominator of the sample aspect ratio assumed
by the video frames.
@end table
For example:
@example
buffer=320:240:yuv410p:1:24:1:1
buffer=width=320:height=240:pix_fmt=yuv410p:time_base=1/24:sar=1
@end example
will instruct the source to accept video frames with size 320x240 and
with format "yuv410p", assuming 1/24 as the timestamps timebase and
square pixels (1:1 sample aspect ratio).
Since the pixel format with name "yuv410p" corresponds to the number 6
(check the enum AVPixelFormat definition in @file{libavutil/pixfmt.h}),
this example corresponds to:
@example
buffer=320:240:6:1:24
@end example
@section color

69
libavfilter/buffersrc.c
View File

@ -23,6 +23,8 @@
* memory buffer source filter
*/
#include <float.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/fifo.h"
@ -45,6 +47,7 @@ typedef struct {
/* video only */
int h, w;
enum AVPixelFormat pix_fmt;
char *pix_fmt_str;
AVRational pixel_aspect;
/* audio only */
@ -236,21 +239,17 @@ fail:
static av_cold int init_video(AVFilterContext *ctx, const char *args)
{
BufferSourceContext *c = ctx->priv;
char pix_fmt_str[128];
int n = 0;
if (!args ||
(n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
&c->time_base.num, &c->time_base.den,
&c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
if (!c->pix_fmt_str || !c->w || !c->h || av_q2d(c->time_base) <= 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
return AVERROR(EINVAL);
}
if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == AV_PIX_FMT_NONE) {
if ((c->pix_fmt = av_get_pix_fmt(c->pix_fmt_str)) == AV_PIX_FMT_NONE) {
char *tail;
c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
c->pix_fmt = strtol(c->pix_fmt_str, &tail, 10);
if (*tail || c->pix_fmt < 0 || c->pix_fmt >= AV_PIX_FMT_NB) {
av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", c->pix_fmt_str);
return AVERROR(EINVAL);
}
}
@ -264,6 +263,32 @@ static av_cold int init_video(AVFilterContext *ctx, const char *args)
#define OFFSET(x) offsetof(BufferSourceContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
#define V AV_OPT_FLAG_VIDEO_PARAM
static const AVOption video_options[] = {
{ "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "pix_fmt", NULL, OFFSET(pix_fmt_str), AV_OPT_TYPE_STRING, .flags = V },
#if FF_API_OLD_FILTER_OPTS
/* those 4 are for compatibility with the old option passing system where each filter
* did its own parsing */
{ "time_base_num", "deprecated, do not use", OFFSET(time_base.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "time_base_den", "deprecated, do not use", OFFSET(time_base.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "sar_num", "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "sar_den", "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
#endif
{ "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },
{ "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
{ NULL },
};
static const AVClass buffer_class = {
.class_name = "buffer source",
.item_name = av_default_item_name,
.option = video_options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVOption audio_options[] = {
{ "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
{ "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
@ -284,34 +309,22 @@ static av_cold int init_audio(AVFilterContext *ctx, const char *args)
BufferSourceContext *s = ctx->priv;
int ret = 0;
s->class = &abuffer_class;
av_opt_set_defaults(s);
if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
av_log(ctx, AV_LOG_ERROR, "Error parsing options string: %s.\n", args);
goto fail;
}
s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s.\n",
s->sample_fmt_str);
ret = AVERROR(EINVAL);
goto fail;
return AVERROR(EINVAL);
}
s->channel_layout = av_get_channel_layout(s->channel_layout_str);
if (!s->channel_layout) {
av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
s->channel_layout_str);
ret = AVERROR(EINVAL);
goto fail;
return AVERROR(EINVAL);
}
if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*)))) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
return AVERROR(ENOMEM);
if (!s->time_base.num)
s->time_base = (AVRational){1, s->sample_rate};
@ -320,8 +333,6 @@ static av_cold int init_audio(AVFilterContext *ctx, const char *args)
"ch layout:%s\n", s->time_base.num, s->time_base.den, s->sample_fmt_str,
s->sample_rate, s->channel_layout_str);
fail:
av_opt_free(s);
return ret;
}
@ -430,6 +441,7 @@ AVFilter avfilter_vsrc_buffer = {
.name = "buffer",
.description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
.priv_size = sizeof(BufferSourceContext),
.priv_class = &buffer_class,
.query_formats = query_formats,
.init = init_video,
@ -454,6 +466,7 @@ AVFilter avfilter_asrc_abuffer = {
.name = "abuffer",
.description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
.priv_size = sizeof(BufferSourceContext),
.priv_class = &abuffer_class,
.query_formats = query_formats,
.init = init_audio,