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ffmpeg/libavfilter/buffersrc.c

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/*
* Copyright (c) 2008 Vitor Sessak
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* memory buffer source filter
*/
#include <float.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/frame.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "audio.h"
#include "avfilter.h"
#include "buffersrc.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct BufferSourceContext {
const AVClass *class;
AVFifoBuffer *fifo;
AVRational time_base; ///< time_base to set in the output link
AVRational frame_rate; ///< frame_rate to set in the output link
/* video only */
int h, w;
enum AVPixelFormat pix_fmt;
char *pix_fmt_str;
AVRational pixel_aspect;
AVBufferRef *hw_frames_ctx;
/* audio only */
int sample_rate;
enum AVSampleFormat sample_fmt;
char *sample_fmt_str;
uint64_t channel_layout;
char *channel_layout_str;
int got_format_from_params;
int eof;
} BufferSourceContext;
#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);\
}
AVBufferSrcParameters *av_buffersrc_parameters_alloc(void)
{
AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
if (!par)
return NULL;
par->format = -1;
return par;
}
int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
{
BufferSourceContext *s = ctx->priv;
if (param->time_base.num > 0 && param->time_base.den > 0)
s->time_base = param->time_base;
switch (ctx->filter->outputs[0].type) {
case AVMEDIA_TYPE_VIDEO:
if (param->format != AV_PIX_FMT_NONE) {
s->got_format_from_params = 1;
s->pix_fmt = param->format;
}
if (param->width > 0)
s->w = param->width;
if (param->height > 0)
s->h = param->height;
if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
s->pixel_aspect = param->sample_aspect_ratio;
if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
s->frame_rate = param->frame_rate;
if (param->hw_frames_ctx) {
av_buffer_unref(&s->hw_frames_ctx);
s->hw_frames_ctx = av_buffer_ref(param->hw_frames_ctx);
if (!s->hw_frames_ctx)
return AVERROR(ENOMEM);
}
break;
case AVMEDIA_TYPE_AUDIO:
if (param->format != AV_SAMPLE_FMT_NONE) {
s->got_format_from_params = 1;
s->sample_fmt = param->format;
}
if (param->sample_rate > 0)
s->sample_rate = param->sample_rate;
if (param->channel_layout)
s->channel_layout = param->channel_layout;
break;
default:
return AVERROR_BUG;
}
return 0;
}
int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
{
AVFrame *copy;
int ret = 0;
if (!(copy = av_frame_alloc()))
return AVERROR(ENOMEM);
ret = av_frame_ref(copy, frame);
if (ret >= 0)
ret = av_buffersrc_add_frame(ctx, copy);
av_frame_free(&copy);
return ret;
}
int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx,
AVFrame *frame)
{
BufferSourceContext *s = ctx->priv;
AVFrame *copy;
int refcounted, ret;
if (!frame) {
s->eof = 1;
return 0;
} else if (s->eof)
return AVERROR(EINVAL);
refcounted = !!frame->buf[0];
switch (ctx->outputs[0]->type) {
case AVMEDIA_TYPE_VIDEO:
CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
frame->format);
break;
case AVMEDIA_TYPE_AUDIO:
CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
frame->format);
break;
default:
return AVERROR(EINVAL);
}
if (!av_fifo_space(s->fifo) &&
(ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
sizeof(copy))) < 0)
return ret;
if (!(copy = av_frame_alloc()))
return AVERROR(ENOMEM);
if (refcounted) {
av_frame_move_ref(copy, frame);
} else {
ret = av_frame_ref(copy, frame);
if (ret < 0) {
av_frame_free(&copy);
return ret;
}
}
if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {
if (refcounted)
av_frame_move_ref(frame, copy);
av_frame_free(&copy);
return ret;
}
return 0;
}
static av_cold int init_video(AVFilterContext *ctx)
{
BufferSourceContext *c = ctx->priv;
if (!(c->pix_fmt_str || c->got_format_from_params) || !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_str) {
if ((c->pix_fmt = av_get_pix_fmt(c->pix_fmt_str)) == AV_PIX_FMT_NONE) {
char *tail;
c->pix_fmt = strtol(c->pix_fmt_str, &tail, 10);
if (*tail || c->pix_fmt < 0 || !av_pix_fmt_desc_get(c->pix_fmt)) {
av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", c->pix_fmt_str);
return AVERROR(EINVAL);
}
}
}
if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
return AVERROR(ENOMEM);
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d sar:%d/%d\n",
c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
c->time_base.num, c->time_base.den,
c->pixel_aspect.num, c->pixel_aspect.den);
return 0;
}
#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 },
{ "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
{ "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
{ "frame_rate", NULL, OFFSET(frame_rate), 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 },
{ "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)
{
BufferSourceContext *s = ctx->priv;
int ret = 0;
if (!(s->sample_fmt_str || s->got_format_from_params)) {
av_log(ctx, AV_LOG_ERROR, "Sample format not provided\n");
return AVERROR(EINVAL);
}
if (s->sample_fmt_str)
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);
return AVERROR(EINVAL);
}
if (s->channel_layout_str)
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);
return AVERROR(EINVAL);
}
if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
return AVERROR(ENOMEM);
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);
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSourceContext *s = ctx->priv;
while (s->fifo && av_fifo_size(s->fifo)) {
AVFrame *frame;
av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
av_frame_free(&frame);
}
av_buffer_unref(&s->hw_frames_ctx);
av_fifo_free(s->fifo);
s->fifo = NULL;
}
static int query_formats(AVFilterContext *ctx)
{
BufferSourceContext *c = ctx->priv;
AVFilterChannelLayouts *channel_layouts = NULL;
AVFilterFormats *formats = NULL;
AVFilterFormats *samplerates = NULL;
switch (ctx->outputs[0]->type) {
case AVMEDIA_TYPE_VIDEO:
ff_add_format(&formats, c->pix_fmt);
ff_set_common_formats(ctx, formats);
break;
case AVMEDIA_TYPE_AUDIO:
ff_add_format(&formats, c->sample_fmt);
ff_set_common_formats(ctx, formats);
ff_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);
}
return 0;
}
static int config_props(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
switch (link->type) {
case AVMEDIA_TYPE_VIDEO:
link->w = c->w;
link->h = c->h;
link->sample_aspect_ratio = c->pixel_aspect;
if (c->hw_frames_ctx) {
link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);
if (!link->hw_frames_ctx)
return AVERROR(ENOMEM);
}
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;
link->frame_rate = c->frame_rate;
return 0;
}
static int request_frame(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
AVFrame *frame;
int ret = 0;
if (!av_fifo_size(c->fifo)) {
if (c->eof)
return AVERROR_EOF;
return AVERROR(EAGAIN);
}
av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
ret = ff_filter_frame(link, frame);
return ret;
}
static int poll_frame(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
int size = av_fifo_size(c->fifo);
if (!size && c->eof)
return AVERROR_EOF;
return size/sizeof(AVFrame*);
}
static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.poll_frame = poll_frame,
.config_props = config_props,
},
{ NULL }
};
AVFilter ff_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,
.uninit = uninit,
.inputs = NULL,
.outputs = avfilter_vsrc_buffer_outputs,
};
static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.request_frame = request_frame,
.poll_frame = poll_frame,
.config_props = config_props,
},
{ NULL }
};
AVFilter ff_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,
.uninit = uninit,
.inputs = NULL,
.outputs = avfilter_asrc_abuffer_outputs,
};
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