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ffmpeg/libavfilter/buffersrc.c

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/*
* Copyright (c) 2008 Vitor Sessak
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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"
#include "avcodec.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
unsigned nb_failed_requests;
unsigned warning_limit;
/* video only */
int w, h;
enum AVPixelFormat pix_fmt;
AVRational pixel_aspect;
char *sws_param;
/* audio only */
int sample_rate;
enum AVSampleFormat sample_fmt;
int channels;
uint64_t channel_layout;
char *channel_layout_str;
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_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\
}
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)\
if (c->sample_fmt != format || c->sample_rate != srate ||\
c->channel_layout != ch_layout || c->channels != ch_count) {\
av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
return AVERROR(EINVAL);\
}
int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
{
return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
AV_BUFFERSRC_FLAG_KEEP_REF);
}
int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
{
return av_buffersrc_add_frame_flags(ctx, frame, 0);
}
static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
AVFrame *frame, int flags);
int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
{
AVFrame *copy = NULL;
int ret = 0;
if (frame && frame->channel_layout &&
av_get_channel_layout_nb_channels(frame->channel_layout) != av_frame_get_channels(frame)) {
av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
return AVERROR(EINVAL);
}
if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)
return av_buffersrc_add_frame_internal(ctx, frame, flags);
if (!(copy = av_frame_alloc()))
return AVERROR(ENOMEM);
ret = av_frame_ref(copy, frame);
if (ret >= 0)
ret = av_buffersrc_add_frame_internal(ctx, copy, flags);
av_frame_free(&copy);
return ret;
}
static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
AVFrame *frame, int flags)
{
BufferSourceContext *s = ctx->priv;
AVFrame *copy;
int refcounted, ret;
s->nb_failed_requests = 0;
if (!frame) {
s->eof = 1;
return 0;
} else if (s->eof)
return AVERROR(EINVAL);
refcounted = !!frame->buf[0];
if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
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:
/* For layouts unknown on input but known on link after negotiation. */
if (!frame->channel_layout)
frame->channel_layout = s->channel_layout;
CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
av_frame_get_channels(frame), 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;
}
if ((flags & AV_BUFFERSRC_FLAG_PUSH))
if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
return ret;
return 0;
}
#if FF_API_AVFILTERBUFFER
FF_DISABLE_DEPRECATION_WARNINGS
static void compat_free_buffer(void *opaque, uint8_t *data)
{
AVFilterBufferRef *buf = opaque;
AV_NOWARN_DEPRECATED(
avfilter_unref_buffer(buf);
)
}
static void compat_unref_buffer(void *opaque, uint8_t *data)
{
AVBufferRef *buf = opaque;
AV_NOWARN_DEPRECATED(
av_buffer_unref(&buf);
)
}
int av_buffersrc_add_ref(AVFilterContext *ctx, AVFilterBufferRef *buf,
int flags)
{
BufferSourceContext *s = ctx->priv;
AVFrame *frame = NULL;
AVBufferRef *dummy_buf = NULL;
int ret = 0, planes, i;
if (!buf) {
s->eof = 1;
return 0;
} else if (s->eof)
return AVERROR(EINVAL);
frame = av_frame_alloc();
if (!frame)
return AVERROR(ENOMEM);
dummy_buf = av_buffer_create(NULL, 0, compat_free_buffer, buf,
(buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY);
if (!dummy_buf) {
ret = AVERROR(ENOMEM);
goto fail;
}
AV_NOWARN_DEPRECATED(
if ((ret = avfilter_copy_buf_props(frame, buf)) < 0)
goto fail;
)
#define WRAP_PLANE(ref_out, data, data_size) \
do { \
AVBufferRef *dummy_ref = av_buffer_ref(dummy_buf); \
if (!dummy_ref) { \
ret = AVERROR(ENOMEM); \
goto fail; \
} \
ref_out = av_buffer_create(data, data_size, compat_unref_buffer, \
dummy_ref, (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY); \
if (!ref_out) { \
av_frame_unref(frame); \
ret = AVERROR(ENOMEM); \
goto fail; \
} \
} while (0)
if (ctx->outputs[0]->type == AVMEDIA_TYPE_VIDEO) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
planes = av_pix_fmt_count_planes(frame->format);
if (!desc || planes <= 0) {
ret = AVERROR(EINVAL);
goto fail;
}
for (i = 0; i < planes; i++) {
int v_shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
int plane_size = (frame->height >> v_shift) * frame->linesize[i];
WRAP_PLANE(frame->buf[i], frame->data[i], plane_size);
}
} else {
int planar = av_sample_fmt_is_planar(frame->format);
int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
planes = planar ? channels : 1;
if (planes > FF_ARRAY_ELEMS(frame->buf)) {
frame->nb_extended_buf = planes - FF_ARRAY_ELEMS(frame->buf);
frame->extended_buf = av_mallocz_array(sizeof(*frame->extended_buf),
frame->nb_extended_buf);
if (!frame->extended_buf) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
for (i = 0; i < FFMIN(planes, FF_ARRAY_ELEMS(frame->buf)); i++)
WRAP_PLANE(frame->buf[i], frame->extended_data[i], frame->linesize[0]);
for (i = 0; i < planes - FF_ARRAY_ELEMS(frame->buf); i++)
WRAP_PLANE(frame->extended_buf[i],
frame->extended_data[i + FF_ARRAY_ELEMS(frame->buf)],
frame->linesize[0]);
}
ret = av_buffersrc_add_frame_flags(ctx, frame, flags);
fail:
av_buffer_unref(&dummy_buf);
av_frame_free(&frame);
return ret;
}
FF_ENABLE_DEPRECATION_WARNINGS
int av_buffersrc_buffer(AVFilterContext *ctx, AVFilterBufferRef *buf)
{
return av_buffersrc_add_ref(ctx, buf, 0);
}
#endif
static av_cold int init_video(AVFilterContext *ctx)
{
BufferSourceContext *c = ctx->priv;
if (c->pix_fmt == AV_PIX_FMT_NONE || !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->fifo = av_fifo_alloc(sizeof(AVFrame*))))
return AVERROR(ENOMEM);
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d sws_param:%s\n",
c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
c->warning_limit = 100;
return 0;
}
unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
{
return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
}
#define OFFSET(x) offsetof(BufferSourceContext, x)
#define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
#define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption buffer_options[] = {
{ "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
{ "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "pix_fmt", NULL, OFFSET(pix_fmt), AV_OPT_TYPE_PIXEL_FMT, { .i64 = AV_PIX_FMT_NONE }, .min = AV_PIX_FMT_NONE, .max = INT_MAX, .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 },
{ "pixel_aspect", "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 },
{ "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
{ "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = V },
{ NULL },
};
AVFILTER_DEFINE_CLASS(buffer);
static const AVOption abuffer_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), AV_OPT_TYPE_SAMPLE_FMT, { .i64 = AV_SAMPLE_FMT_NONE }, .min = AV_SAMPLE_FMT_NONE, .max = INT_MAX, .flags = A },
{ "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
{ "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
{ NULL },
};
AVFILTER_DEFINE_CLASS(abuffer);
static av_cold int init_audio(AVFilterContext *ctx)
{
BufferSourceContext *s = ctx->priv;
int ret = 0;
if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
return AVERROR(EINVAL);
}
if (s->channel_layout_str) {
int n;
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);
}
n = av_get_channel_layout_nb_channels(s->channel_layout);
if (s->channels) {
if (n != s->channels) {
av_log(ctx, AV_LOG_ERROR,
"Mismatching channel count %d and layout '%s' "
"(%d channels)\n",
s->channels, s->channel_layout_str, n);
return AVERROR(EINVAL);
}
}
s->channels = n;
} else if (!s->channels) {
av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
"channel layout specified\n");
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 chlayout:%s\n",
s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),
s->sample_rate, s->channel_layout_str);
s->warning_limit = 100;
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_fifo_freep(&s->fifo);
}
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 ? c->channel_layout :
FF_COUNT2LAYOUT(c->channels));
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;
break;
case AVMEDIA_TYPE_AUDIO:
if (!c->channel_layout)
c->channel_layout = link->channel_layout;
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;
if (!av_fifo_size(c->fifo)) {
if (c->eof)
return AVERROR_EOF;
c->nb_failed_requests++;
return AVERROR(EAGAIN);
}
av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
return ff_filter_frame(link, frame);
}
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),
.query_formats = query_formats,
.init = init_video,
.uninit = uninit,
.inputs = NULL,
.outputs = avfilter_vsrc_buffer_outputs,
.priv_class = &buffer_class,
};
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),
.query_formats = query_formats,
.init = init_audio,
.uninit = uninit,
.inputs = NULL,
.outputs = avfilter_asrc_abuffer_outputs,
.priv_class = &abuffer_class,
};
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