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lavfi: add an audio buffer source.

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This commit is contained in:
Anton Khirnov 2012-05-04 18:57:04 +02:00
parent 720c6b78d1
commit 4c66c40718
3 changed files with 222 additions and 20 deletions
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27
doc/filters.texi
View File

@ -151,6 +151,33 @@ anullsrc=48000:4
anullsrc=48000:mono
@end example
@section abuffer
Buffer audio frames, and make them available to the filter chain.
This source is not intended to be part of user-supplied graph descriptions but
for insertion by calling programs through the interface defined in
@file{libavfilter/buffersrc.h}.
It accepts the following named parameters:
@table @option
@item time_base
Timebase which will be used for timestamps of submitted frames. It must be
either a floating-point number or in @var{numerator}/@var{denominator} form.
@item sample_rate
Audio sample rate.
@item sample_fmt
Name of the sample format, as returned by @code{av_get_sample_fmt_name()}.
@item channel_layout
Channel layout of the audio data, in the form that can be accepted by
@code{av_get_channel_layout()}.
@end table
All the parameters need to be explicitly defined.
@c man end AUDIO SOURCES
@chapter Audio Sinks

4
libavfilter/allfilters.c
View File

@ -95,6 +95,10 @@ void avfilter_register_all(void)
extern AVFilter avfilter_vsrc_buffer;
avfilter_register(&avfilter_vsrc_buffer);
}
{
extern AVFilter avfilter_asrc_abuffer;
avfilter_register(&avfilter_asrc_abuffer);
}
{
extern AVFilter avfilter_vsink_buffer;
avfilter_register(&avfilter_vsink_buffer);

211
libavfilter/buffersrc.c
View File

@ -23,27 +23,51 @@
* memory buffer source filter
*/
#include "audio.h"
#include "avfilter.h"
#include "buffersrc.h"
#include "formats.h"
#include "vsrc_buffer.h"
#include "libavutil/audioconvert.h"
#include "libavutil/fifo.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
typedef struct {
const AVClass *class;
AVFifoBuffer *fifo;
AVRational time_base; ///< time_base to set in the output link
/* video only */
int h, w;
enum PixelFormat pix_fmt;
AVRational time_base; ///< time_base to set in the output link
AVRational pixel_aspect;
/* audio only */
int sample_rate;
enum AVSampleFormat sample_fmt;
char *sample_fmt_str;
uint64_t channel_layout;
char *channel_layout_str;
int eof;
} BufferSourceContext;
#define CHECK_PARAM_CHANGE(s, c, width, height, format)\
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
if (c->w != width || c->h != height || c->pix_fmt != format) {\
av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
return AVERROR(EINVAL);\
}
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\
if (c->sample_fmt != format || c->sample_rate != srate ||\
c->channel_layout != ch_layout) {\
av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
return AVERROR(EINVAL);\
}
#if FF_API_VSRC_BUFFER_ADD_FRAME
int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
int64_t pts, AVRational pixel_aspect)
@ -80,12 +104,28 @@ int av_buffersrc_write_frame(AVFilterContext *buffer_filter, AVFrame *frame)
sizeof(buf))) < 0)
return ret;
CHECK_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height, frame->format);
buf = avfilter_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
c->w, c->h);
av_image_copy(buf->data, buf->linesize, frame->data, frame->linesize,
c->pix_fmt, c->w, c->h);
switch (buffer_filter->outputs[0]->type) {
case AVMEDIA_TYPE_VIDEO:
CHECK_VIDEO_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height,
frame->format);
buf = avfilter_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
c->w, c->h);
av_image_copy(buf->data, buf->linesize, frame->data, frame->linesize,
c->pix_fmt, c->w, c->h);
break;
case AVMEDIA_TYPE_AUDIO:
CHECK_AUDIO_PARAM_CHANGE(buffer_filter, c, frame->sample_rate, frame->channel_layout,
frame->format);
buf = ff_get_audio_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
frame->nb_samples);
av_samples_copy(buf->extended_data, frame->extended_data,
0, 0, frame->nb_samples,
av_get_channel_layout_nb_channels(frame->channel_layout),
frame->format);
break;
default:
return AVERROR(EINVAL);
}
avfilter_copy_frame_props(buf, frame);
@ -113,7 +153,17 @@ int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
sizeof(buf))) < 0)
return ret;
CHECK_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
switch (s->outputs[0]->type) {
case AVMEDIA_TYPE_VIDEO:
CHECK_VIDEO_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
break;
case AVMEDIA_TYPE_AUDIO:
CHECK_AUDIO_PARAM_CHANGE(s, c, buf->audio->sample_rate, buf->audio->channel_layout,
buf->format);
break;
default:
return AVERROR(EINVAL);
}
if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0)
return ret;
@ -121,7 +171,7 @@ int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
return 0;
}
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
static av_cold int init_video(AVFilterContext *ctx, const char *args, void *opaque)
{
BufferSourceContext *c = ctx->priv;
char pix_fmt_str[128];
@ -150,6 +200,69 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
return 0;
}
#define OFFSET(x) offsetof(BufferSourceContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM
static const AVOption audio_options[] = {
{ "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { 0 }, 0, INT_MAX, A },
{ "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { 0 }, 0, INT_MAX, A },
{ "sample_fmt", NULL, OFFSET(sample_fmt_str), AV_OPT_TYPE_STRING, .flags = A },
{ "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
{ NULL },
};
static const AVClass abuffer_class = {
.class_name = "abuffer source",
.item_name = av_default_item_name,
.option = audio_options,
.version = LIBAVUTIL_VERSION_INT,
};
static av_cold int init_audio(AVFilterContext *ctx, const char *args, void *opaque)
{
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;
}
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;
}
if (!(s->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (!s->time_base.num)
s->time_base = (AVRational){1, s->sample_rate};
av_log(ctx, AV_LOG_VERBOSE, "tb:%d/%d samplefmt:%s samplerate: %d "
"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;
}
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSourceContext *s = ctx->priv;
@ -165,9 +278,29 @@ static av_cold void uninit(AVFilterContext *ctx)
static int query_formats(AVFilterContext *ctx)
{
BufferSourceContext *c = ctx->priv;
enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
AVFilterChannelLayouts *channel_layouts = NULL;
AVFilterFormats *formats = NULL;
AVFilterFormats *samplerates = NULL;
switch (ctx->outputs[0]->type) {
case AVMEDIA_TYPE_VIDEO:
avfilter_add_format(&formats, c->pix_fmt);
avfilter_set_common_formats(ctx, formats);
break;
case AVMEDIA_TYPE_AUDIO:
avfilter_add_format(&formats, c->sample_fmt);
avfilter_set_common_formats(ctx, formats);
avfilter_add_format(&samplerates, c->sample_rate);
ff_set_common_samplerates(ctx, samplerates);
ff_add_channel_layout(&channel_layouts, c->channel_layout);
ff_set_common_channel_layouts(ctx, channel_layouts);
break;
default:
return AVERROR(EINVAL);
}
avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
@ -175,11 +308,21 @@ static int config_props(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
link->w = c->w;
link->h = c->h;
link->sample_aspect_ratio = c->pixel_aspect;
link->time_base = c->time_base;
switch (link->type) {
case AVMEDIA_TYPE_VIDEO:
link->w = c->w;
link->h = c->h;
link->sample_aspect_ratio = c->pixel_aspect;
break;
case AVMEDIA_TYPE_AUDIO:
link->channel_layout = c->channel_layout;
link->sample_rate = c->sample_rate;
break;
default:
return AVERROR(EINVAL);
}
link->time_base = c->time_base;
return 0;
}
@ -195,9 +338,19 @@ static int request_frame(AVFilterLink *link)
}
av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
avfilter_start_frame(link, avfilter_ref_buffer(buf, ~0));
avfilter_draw_slice(link, 0, link->h, 1);
avfilter_end_frame(link);
switch (link->type) {
case AVMEDIA_TYPE_VIDEO:
avfilter_start_frame(link, avfilter_ref_buffer(buf, ~0));
avfilter_draw_slice(link, 0, link->h, 1);
avfilter_end_frame(link);
break;
case AVMEDIA_TYPE_AUDIO:
ff_filter_samples(link, avfilter_ref_buffer(buf, ~0));
break;
default:
return AVERROR(EINVAL);
}
avfilter_unref_buffer(buf);
return 0;
@ -218,7 +371,7 @@ AVFilter avfilter_vsrc_buffer = {
.priv_size = sizeof(BufferSourceContext),
.query_formats = query_formats,
.init = init,
.init = init_video,
.uninit = uninit,
.inputs = (AVFilterPad[]) {{ .name = NULL }},
@ -229,3 +382,21 @@ AVFilter avfilter_vsrc_buffer = {
.config_props = config_props, },
{ .name = NULL}},
};
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),
.query_formats = query_formats,
.init = init_audio,
.uninit = uninit,
.inputs = (AVFilterPad[]) {{ .name = NULL }},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.request_frame = request_frame,
.poll_frame = poll_frame,
.config_props = config_props, },
{ .name = NULL}},
};