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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/frame.h"
#include "libavutil/hwcontext.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/samplefmt.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "buffersrc.h"
#include "filters.h"
#include "formats.h"
#include "internal.h"
typedef struct BufferSourceContext {
const AVClass *class;
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;
/* video only */
int w, h, prev_w, prev_h;
enum AVPixelFormat pix_fmt, prev_pix_fmt;
enum AVColorSpace color_space, prev_color_space;
enum AVColorRange color_range, prev_color_range;
AVRational pixel_aspect;
AVBufferRef *hw_frames_ctx;
/* audio only */
int sample_rate;
enum AVSampleFormat sample_fmt;
int channels;
char *channel_layout_str;
AVChannelLayout ch_layout;
int eof;
int64_t last_pts;
int link_delta, prev_delta;
} BufferSourceContext;
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, csp, range, pts)\
c->link_delta = c->w != width || c->h != height || c->pix_fmt != format ||\
c->color_space != csp || c->color_range != range;\
c->prev_delta = c->prev_w != width || c->prev_h != height || c->prev_pix_fmt != format ||\
c->prev_color_space != csp || c->prev_color_range != range;\
if (c->link_delta) {\
int loglevel = c->prev_delta ? AV_LOG_WARNING : AV_LOG_DEBUG;\
av_log(s, loglevel, "Changing video frame properties on the fly is not supported by all filters.\n");\
av_log(s, loglevel, "filter context - w: %d h: %d fmt: %d csp: %s range: %s, incoming frame - w: %d h: %d fmt: %d csp: %s range: %s pts_time: %s\n",\
c->w, c->h, c->pix_fmt, av_color_space_name(c->color_space), av_color_range_name(c->color_range),\
width, height, format, av_color_space_name(csp), av_color_range_name(range),\
av_ts2timestr(pts, &s->outputs[0]->time_base));\
}\
if (c->prev_delta) {\
if (!c->link_delta)\
av_log(s, AV_LOG_VERBOSE, "video frame properties congruent with link at pts_time: %s\n", av_ts2timestr(pts, &s->outputs[0]->time_base));\
c->prev_w = width;\
c->prev_h = height;\
c->prev_pix_fmt = format;\
c->prev_color_space = csp;\
c->prev_color_range = range;\
}
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)\
if (c->sample_fmt != format || c->sample_rate != srate ||\
av_channel_layout_compare(&c->ch_layout, &layout) || c->channels != layout.nb_channels) {\
av_log(s, AV_LOG_INFO, "filter context - fmt: %s r: %d layout: %"PRIX64" ch: %d, incoming frame - fmt: %s r: %d layout: %"PRIX64" ch: %d pts_time: %s\n",\
av_get_sample_fmt_name(c->sample_fmt), c->sample_rate, c->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ? c->ch_layout.u.mask : 0, c->channels,\
av_get_sample_fmt_name(format), srate, layout.order == AV_CHANNEL_ORDER_NATIVE ? layout.u.mask : 0, layout.nb_channels, av_ts2timestr(pts, &s->outputs[0]->time_base));\
av_log(s, AV_LOG_ERROR, "Changing audio 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;
par->color_range = AVCOL_RANGE_UNSPECIFIED;
par->color_space = AVCOL_SPC_UNSPECIFIED;
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->pix_fmt = s->prev_pix_fmt = param->format;
}
if (param->width > 0)
s->w = s->prev_w = param->width;
if (param->height > 0)
s->h = s->prev_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);
}
if (param->color_space != AVCOL_SPC_UNSPECIFIED)
s->color_space = s->prev_color_space = param->color_space;
if (param->color_range != AVCOL_RANGE_UNSPECIFIED)
s->color_range = s->prev_color_range = param->color_range;
break;
case AVMEDIA_TYPE_AUDIO:
if (param->format != AV_SAMPLE_FMT_NONE) {
s->sample_fmt = param->format;
}
if (param->sample_rate > 0)
s->sample_rate = param->sample_rate;
if (param->ch_layout.nb_channels) {
int ret = av_channel_layout_copy(&s->ch_layout, &param->ch_layout);
if (ret < 0)
return ret;
}
break;
default:
return AVERROR_BUG;
}
return 0;
}
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 push_frame(AVFilterGraph *graph)
{
int ret;
while (1) {
ret = ff_filter_graph_run_once(graph);
if (ret == AVERROR(EAGAIN))
break;
if (ret < 0)
return ret;
}
return 0;
}
int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
{
BufferSourceContext *s = ctx->priv;
AVFrame *copy;
int refcounted, ret;
s->nb_failed_requests = 0;
if (!frame)
return av_buffersrc_close(ctx, s->last_pts, flags);
if (s->eof)
return AVERROR_EOF;
s->last_pts = frame->pts + frame->duration;
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, frame->colorspace,
frame->color_range, frame->pts);
break;
case AVMEDIA_TYPE_AUDIO:
/* For layouts unknown on input but known on link after negotiation. */
if (frame->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC && frame->ch_layout.nb_channels == s->ch_layout.nb_channels) {
ret = av_channel_layout_copy(&frame->ch_layout, &s->ch_layout);
if (ret < 0)
return ret;
}
CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->ch_layout,
frame->format, frame->pts);
break;
default:
return AVERROR(EINVAL);
}
}
if (refcounted && !(flags & AV_BUFFERSRC_FLAG_KEEP_REF)) {
if (!(copy = av_frame_alloc()))
return AVERROR(ENOMEM);
av_frame_move_ref(copy, frame);
} else {
copy = av_frame_clone(frame);
if (!copy)
return AVERROR(ENOMEM);
}
#if FF_API_INTERLACED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
if (copy->interlaced_frame)
copy->flags |= AV_FRAME_FLAG_INTERLACED;
if (copy->top_field_first)
copy->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
#if FF_API_FRAME_KEY
FF_DISABLE_DEPRECATION_WARNINGS
if (copy->key_frame)
copy->flags |= AV_FRAME_FLAG_KEY;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (copy->colorspace == AVCOL_SPC_UNSPECIFIED)
copy->colorspace = ctx->outputs[0]->colorspace;
if (copy->color_range == AVCOL_RANGE_UNSPECIFIED)
copy->color_range = ctx->outputs[0]->color_range;
ret = ff_filter_frame(ctx->outputs[0], copy);
if (ret < 0)
return ret;
if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
ret = push_frame(ctx->graph);
if (ret < 0)
return ret;
}
return 0;
}
int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
{
BufferSourceContext *s = ctx->priv;
s->eof = 1;
ff_avfilter_link_set_in_status(ctx->outputs[0], AVERROR_EOF, pts);
return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;
}
static av_cold int init_video(AVFilterContext *ctx)
{
BufferSourceContext *c = ctx->priv;
if (c->pix_fmt == AV_PIX_FMT_NONE) {
av_log(ctx, AV_LOG_ERROR, "Unspecified pixel format\n");
return AVERROR(EINVAL);
}
if (c->w <= 0 || c->h <= 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid size %dx%d\n", c->w, c->h);
return AVERROR(EINVAL);
}
if (av_q2d(c->time_base) <= 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid time base %d/%d\n", c->time_base.num, c->time_base.den);
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d csp:%s range:%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,
av_color_space_name(c->color_space), av_color_range_name(c->color_range));
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 },
{ "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
{ "pixel_aspect", "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 },
{ "colorspace", "select colorspace", OFFSET(color_space), AV_OPT_TYPE_INT, {.i64=AVCOL_SPC_UNSPECIFIED}, 0, AVCOL_SPC_NB-1, V, .unit = "colorspace"},
{ "gbr", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_RGB}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "bt709", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT709}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_UNSPECIFIED}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "fcc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_FCC}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "bt470bg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT470BG}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "smpte170m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE170M}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "smpte240m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE240M}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "ycgco", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_YCGCO}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "ycgco-re", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_YCGCO_RE}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "ycgco-ro", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_YCGCO_RO}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "bt2020nc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT2020_NCL}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "bt2020c", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT2020_CL}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "smpte2085", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE2085}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "chroma-derived-nc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_CHROMA_DERIVED_NCL},INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "chroma-derived-c", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_CHROMA_DERIVED_CL}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "ictcp", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_ICTCP}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "ipt-c2", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_IPT_C2}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
{ "range", "select color range", OFFSET(color_range), AV_OPT_TYPE_INT, {.i64=AVCOL_RANGE_UNSPECIFIED}, 0, AVCOL_RANGE_NB-1, V, .unit = "range"},
{ "unspecified", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED}, 0, 0, V, .unit = "range"},
{ "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED}, 0, 0, V, .unit = "range"},
{ "limited", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG}, 0, 0, V, .unit = "range"},
{ "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG}, 0, 0, V, .unit = "range"},
{ "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG}, 0, 0, V, .unit = "range"},
{ "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
{ "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
{ "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
{ 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;
char buf[128];
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 || s->ch_layout.nb_channels) {
int n;
if (!s->ch_layout.nb_channels) {
ret = av_channel_layout_from_string(&s->ch_layout, s->channel_layout_str);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
s->channel_layout_str);
return AVERROR(EINVAL);
}
}
n = s->ch_layout.nb_channels;
av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
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, buf, 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);
} else {
s->ch_layout = FF_COUNT2LAYOUT(s->channels);
av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
}
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, buf);
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
BufferSourceContext *s = ctx->priv;
av_buffer_unref(&s->hw_frames_ctx);
av_channel_layout_uninit(&s->ch_layout);
}
static int query_formats(AVFilterContext *ctx)
{
BufferSourceContext *c = ctx->priv;
AVFilterChannelLayouts *channel_layouts = NULL;
AVFilterFormats *formats = NULL;
AVFilterFormats *samplerates = NULL;
AVFilterFormats *color_spaces = NULL;
AVFilterFormats *color_ranges = NULL;
int ret;
switch (ctx->outputs[0]->type) {
case AVMEDIA_TYPE_VIDEO: {
enum AVPixelFormat swfmt = c->pix_fmt;
if (av_pix_fmt_desc_get(swfmt)->flags & AV_PIX_FMT_FLAG_HWACCEL) {
if (!c->hw_frames_ctx) {
av_log(ctx, AV_LOG_ERROR, "Setting BufferSourceContext.pix_fmt "
"to a HW format requires hw_frames_ctx to be non-NULL!\n");
return AVERROR(EINVAL);
}
swfmt = ((AVHWFramesContext *) c->hw_frames_ctx->data)->sw_format;
}
if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
(ret = ff_set_common_formats (ctx , formats )) < 0)
return ret;
/* force specific colorspace/range downstream only for ordinary YUV */
if (ff_fmt_is_regular_yuv(swfmt)) {
if ((ret = ff_add_format(&color_spaces, c->color_space)) < 0 ||
(ret = ff_set_common_color_spaces(ctx, color_spaces)) < 0)
return ret;
if ((ret = ff_add_format(&color_ranges, c->color_range)) < 0)
return ret;
if (c->color_range == AVCOL_RANGE_UNSPECIFIED) {
/* allow implicitly promoting unspecified to mpeg */
if ((ret = ff_add_format(&color_ranges, AVCOL_RANGE_MPEG)) < 0)
return ret;
}
if ((ret = ff_set_common_color_ranges(ctx, color_ranges)) < 0)
return ret;
}
break;
}
case AVMEDIA_TYPE_AUDIO:
if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
(ret = ff_set_common_formats (ctx , formats )) < 0 ||
(ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
(ret = ff_set_common_samplerates (ctx , samplerates )) < 0)
return ret;
if ((ret = ff_add_channel_layout(&channel_layouts, &c->ch_layout)) < 0)
return ret;
if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)
return ret;
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:
if (!c->ch_layout.nb_channels || c->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) {
int ret = av_channel_layout_copy(&c->ch_layout, &link->ch_layout);
if (ret < 0)
return ret;
}
break;
default:
return AVERROR(EINVAL);
}
link->time_base = c->time_base;
link->frame_rate = c->frame_rate;
return 0;
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *outlink = ctx->outputs[0];
BufferSourceContext *c = ctx->priv;
if (!c->eof && ff_outlink_get_status(outlink)) {
c->eof = 1;
return 0;
}
if (c->eof) {
ff_outlink_set_status(outlink, AVERROR_EOF, c->last_pts);
return 0;
}
c->nb_failed_requests++;
return FFERROR_NOT_READY;
}
static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
},
};
const 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),
.activate = activate,
.init = init_video,
.uninit = uninit,
.inputs = NULL,
FILTER_OUTPUTS(avfilter_vsrc_buffer_outputs),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &buffer_class,
};
static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_props,
},
};
const 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),
.activate = activate,
.init = init_audio,
.uninit = uninit,
.inputs = NULL,
FILTER_OUTPUTS(avfilter_asrc_abuffer_outputs),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &abuffer_class,
};