yading@10: /*
yading@10:  * Copyright (c) 2008 Vitor Sessak
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * memory buffer source filter
yading@10:  */
yading@10: 
yading@10: #include <float.h>
yading@10: 
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/fifo.h"
yading@10: #include "libavutil/frame.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/samplefmt.h"
yading@10: #include "audio.h"
yading@10: #include "avfilter.h"
yading@10: #include "buffersrc.h"
yading@10: #include "formats.h"
yading@10: #include "internal.h"
yading@10: #include "video.h"
yading@10: #include "avcodec.h"
yading@10: 
yading@10: typedef struct {
yading@10:     const AVClass    *class;
yading@10:     AVFifoBuffer     *fifo;
yading@10:     AVRational        time_base;     ///< time_base to set in the output link
yading@10:     AVRational        frame_rate;    ///< frame_rate to set in the output link
yading@10:     unsigned          nb_failed_requests;
yading@10:     unsigned          warning_limit;
yading@10: 
yading@10:     /* video only */
yading@10:     int               w, h;
yading@10:     enum AVPixelFormat  pix_fmt;
yading@10:     char               *pix_fmt_str;
yading@10:     AVRational        pixel_aspect;
yading@10:     char              *sws_param;
yading@10: 
yading@10:     /* audio only */
yading@10:     int sample_rate;
yading@10:     enum AVSampleFormat sample_fmt;
yading@10:     char               *sample_fmt_str;
yading@10:     int channels;
yading@10:     uint64_t channel_layout;
yading@10:     char    *channel_layout_str;
yading@10: 
yading@10:     int eof;
yading@10: } BufferSourceContext;
yading@10: 
yading@10: #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
yading@10:     if (c->w != width || c->h != height || c->pix_fmt != format) {\
yading@10:         av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\
yading@10:     }
yading@10: 
yading@10: #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)\
yading@10:     if (c->sample_fmt != format || c->sample_rate != srate ||\
yading@10:         c->channel_layout != ch_layout || c->channels != ch_count) {\
yading@10:         av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
yading@10:         return AVERROR(EINVAL);\
yading@10:     }
yading@10: 
yading@10: int av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
yading@10: {
yading@10:     return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
yading@10:                                         AV_BUFFERSRC_FLAG_KEEP_REF);
yading@10: }
yading@10: 
yading@10: int av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
yading@10: {
yading@10:     return av_buffersrc_add_frame_flags(ctx, frame, 0);
yading@10: }
yading@10: 
yading@10: static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
yading@10:                                            AVFrame *frame, int flags);
yading@10: 
yading@10: int av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
yading@10: {
yading@10:     AVFrame *copy = NULL;
yading@10:     int ret = 0;
yading@10: 
yading@10:     if (frame && frame->channel_layout &&
yading@10:         av_get_channel_layout_nb_channels(frame->channel_layout) != av_frame_get_channels(frame)) {
yading@10:         av_log(0, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)
yading@10:         return av_buffersrc_add_frame_internal(ctx, frame, flags);
yading@10: 
yading@10:     if (!(copy = av_frame_alloc()))
yading@10:         return AVERROR(ENOMEM);
yading@10:     ret = av_frame_ref(copy, frame);
yading@10:     if (ret >= 0)
yading@10:         ret = av_buffersrc_add_frame_internal(ctx, copy, flags);
yading@10: 
yading@10:     av_frame_free(&copy);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int attribute_align_arg av_buffersrc_add_frame_internal(AVFilterContext *ctx,
yading@10:                                                                AVFrame *frame, int flags)
yading@10: {
yading@10:     BufferSourceContext *s = ctx->priv;
yading@10:     AVFrame *copy;
yading@10:     int ret;
yading@10: 
yading@10:     s->nb_failed_requests = 0;
yading@10: 
yading@10:     if (!frame) {
yading@10:         s->eof = 1;
yading@10:         return 0;
yading@10:     } else if (s->eof)
yading@10:         return AVERROR(EINVAL);
yading@10: 
yading@10:     if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
yading@10: 
yading@10:     switch (ctx->outputs[0]->type) {
yading@10:     case AVMEDIA_TYPE_VIDEO:
yading@10:         CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
yading@10:                                  frame->format);
yading@10:         break;
yading@10:     case AVMEDIA_TYPE_AUDIO:
yading@10:         /* For layouts unknown on input but known on link after negotiation. */
yading@10:         if (!frame->channel_layout)
yading@10:             frame->channel_layout = s->channel_layout;
yading@10:         CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
yading@10:                                  av_frame_get_channels(frame), frame->format);
yading@10:         break;
yading@10:     default:
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     }
yading@10: 
yading@10:     if (!av_fifo_space(s->fifo) &&
yading@10:         (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
yading@10:                                          sizeof(copy))) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (!(copy = av_frame_alloc()))
yading@10:         return AVERROR(ENOMEM);
yading@10:     av_frame_move_ref(copy, frame);
yading@10: 
yading@10:     if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {
yading@10:         av_frame_move_ref(frame, copy);
yading@10:         av_frame_free(&copy);
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     if ((flags & AV_BUFFERSRC_FLAG_PUSH))
yading@10:         if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
yading@10:             return ret;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #if FF_API_AVFILTERBUFFER
yading@10: static void compat_free_buffer(void *opaque, uint8_t *data)
yading@10: {
yading@10:     AVFilterBufferRef *buf = opaque;
yading@10:     AV_NOWARN_DEPRECATED(
yading@10:     avfilter_unref_buffer(buf);
yading@10:     )
yading@10: }
yading@10: 
yading@10: static void compat_unref_buffer(void *opaque, uint8_t *data)
yading@10: {
yading@10:     AVBufferRef *buf = opaque;
yading@10:     AV_NOWARN_DEPRECATED(
yading@10:     av_buffer_unref(&buf);
yading@10:     )
yading@10: }
yading@10: 
yading@10: int av_buffersrc_add_ref(AVFilterContext *ctx, AVFilterBufferRef *buf,
yading@10:                          int flags)
yading@10: {
yading@10:     BufferSourceContext *s = ctx->priv;
yading@10:     AVFrame *frame = NULL;
yading@10:     AVBufferRef *dummy_buf = NULL;
yading@10:     int ret = 0, planes, i;
yading@10: 
yading@10:     if (!buf) {
yading@10:         s->eof = 1;
yading@10:         return 0;
yading@10:     } else if (s->eof)
yading@10:         return AVERROR(EINVAL);
yading@10: 
yading@10:     frame = av_frame_alloc();
yading@10:     if (!frame)
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     dummy_buf = av_buffer_create(NULL, 0, compat_free_buffer, buf,
yading@10:                                  (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY);
yading@10:     if (!dummy_buf) {
yading@10:         ret = AVERROR(ENOMEM);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     AV_NOWARN_DEPRECATED(
yading@10:     if ((ret = avfilter_copy_buf_props(frame, buf)) < 0)
yading@10:         goto fail;
yading@10:     )
yading@10: 
yading@10: #define WRAP_PLANE(ref_out, data, data_size)                            \
yading@10: do {                                                                    \
yading@10:     AVBufferRef *dummy_ref = av_buffer_ref(dummy_buf);                  \
yading@10:     if (!dummy_ref) {                                                   \
yading@10:         ret = AVERROR(ENOMEM);                                          \
yading@10:         goto fail;                                                      \
yading@10:     }                                                                   \
yading@10:     ref_out = av_buffer_create(data, data_size, compat_unref_buffer,    \
yading@10:                                dummy_ref, (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY);                           \
yading@10:     if (!ref_out) {                                                     \
yading@10:         av_frame_unref(frame);                                          \
yading@10:         ret = AVERROR(ENOMEM);                                          \
yading@10:         goto fail;                                                      \
yading@10:     }                                                                   \
yading@10: } while (0)
yading@10: 
yading@10:     if (ctx->outputs[0]->type  == AVMEDIA_TYPE_VIDEO) {
yading@10:         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
yading@10: 
yading@10:         planes = av_pix_fmt_count_planes(frame->format);
yading@10:         if (!desc || planes <= 0) {
yading@10:             ret = AVERROR(EINVAL);
yading@10:             goto fail;
yading@10:         }
yading@10: 
yading@10:         for (i = 0; i < planes; i++) {
yading@10:             int v_shift    = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
yading@10:             int plane_size = (frame->height >> v_shift) * frame->linesize[i];
yading@10: 
yading@10:             WRAP_PLANE(frame->buf[i], frame->data[i], plane_size);
yading@10:         }
yading@10:     } else {
yading@10:         int planar = av_sample_fmt_is_planar(frame->format);
yading@10:         int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
yading@10: 
yading@10:         planes = planar ? channels : 1;
yading@10: 
yading@10:         if (planes > FF_ARRAY_ELEMS(frame->buf)) {
yading@10:             frame->nb_extended_buf = planes - FF_ARRAY_ELEMS(frame->buf);
yading@10:             frame->extended_buf = av_mallocz(sizeof(*frame->extended_buf) *
yading@10:                                              frame->nb_extended_buf);
yading@10:             if (!frame->extended_buf) {
yading@10:                 ret = AVERROR(ENOMEM);
yading@10:                 goto fail;
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         for (i = 0; i < FFMIN(planes, FF_ARRAY_ELEMS(frame->buf)); i++)
yading@10:             WRAP_PLANE(frame->buf[i], frame->extended_data[i], frame->linesize[0]);
yading@10: 
yading@10:         for (i = 0; i < planes - FF_ARRAY_ELEMS(frame->buf); i++)
yading@10:             WRAP_PLANE(frame->extended_buf[i],
yading@10:                        frame->extended_data[i + FF_ARRAY_ELEMS(frame->buf)],
yading@10:                        frame->linesize[0]);
yading@10:     }
yading@10: 
yading@10:     ret = av_buffersrc_add_frame_flags(ctx, frame, flags);
yading@10: 
yading@10: fail:
yading@10:     av_buffer_unref(&dummy_buf);
yading@10:     av_frame_free(&frame);
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: int av_buffersrc_buffer(AVFilterContext *ctx, AVFilterBufferRef *buf)
yading@10: {
yading@10:     return av_buffersrc_add_ref(ctx, buf, 0);
yading@10: }
yading@10: #endif
yading@10: 
yading@10: static av_cold int init_video(AVFilterContext *ctx)
yading@10: {
yading@10:     BufferSourceContext *c = ctx->priv;
yading@10: 
yading@10:     if (c->pix_fmt == AV_PIX_FMT_NONE || !c->w || !c->h || av_q2d(c->time_base) <= 0) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     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",
yading@10:            c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
yading@10:            c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
yading@10:            c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
yading@10:     c->warning_limit = 100;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
yading@10: {
yading@10:     return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
yading@10: }
yading@10: 
yading@10: #define OFFSET(x) offsetof(BufferSourceContext, x)
yading@10: #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
yading@10: #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
yading@10: 
yading@10: static const AVOption buffer_options[] = {
yading@10:     { "width",         NULL,                     OFFSET(w),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
yading@10:     { "video_size",    NULL,                     OFFSET(w),                AV_OPT_TYPE_IMAGE_SIZE,                .flags = V },
yading@10:     { "height",        NULL,                     OFFSET(h),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
yading@10:     { "pix_fmt",       NULL,                     OFFSET(pix_fmt),          AV_OPT_TYPE_PIXEL_FMT,                 .flags = V },
yading@10: #if FF_API_OLD_FILTER_OPTS
yading@10:     /* those 4 are for compatibility with the old option passing system where each filter
yading@10:      * did its own parsing */
yading@10:     { "time_base_num", "deprecated, do not use", OFFSET(time_base.num),    AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
yading@10:     { "time_base_den", "deprecated, do not use", OFFSET(time_base.den),    AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
yading@10:     { "sar_num",       "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
yading@10:     { "sar_den",       "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
yading@10: #endif
yading@10:     { "sar",           "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },
yading@10:     { "pixel_aspect",  "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },
yading@10:     { "time_base",     NULL,                     OFFSET(time_base),        AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
yading@10:     { "frame_rate",    NULL,                     OFFSET(frame_rate),       AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
yading@10:     { "sws_param",     NULL,                     OFFSET(sws_param),        AV_OPT_TYPE_STRING,                    .flags = V },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: AVFILTER_DEFINE_CLASS(buffer);
yading@10: 
yading@10: static const AVOption abuffer_options[] = {
yading@10:     { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
yading@10:     { "sample_rate",    NULL, OFFSET(sample_rate),         AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
yading@10:     { "sample_fmt",     NULL, OFFSET(sample_fmt_str),      AV_OPT_TYPE_STRING,             .flags = A },
yading@10:     { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },
yading@10:     { "channels",       NULL, OFFSET(channels),            AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: AVFILTER_DEFINE_CLASS(abuffer);
yading@10: 
yading@10: static av_cold int init_audio(AVFilterContext *ctx)
yading@10: {
yading@10:     BufferSourceContext *s = ctx->priv;
yading@10:     int ret = 0;
yading@10: 
yading@10:     s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
yading@10:     if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s\n",
yading@10:                s->sample_fmt_str);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (s->channel_layout_str) {
yading@10:         int n;
yading@10:         /* TODO reindent */
yading@10:     s->channel_layout = av_get_channel_layout(s->channel_layout_str);
yading@10:     if (!s->channel_layout) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
yading@10:                s->channel_layout_str);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:         n = av_get_channel_layout_nb_channels(s->channel_layout);
yading@10:         if (s->channels) {
yading@10:             if (n != s->channels) {
yading@10:                 av_log(ctx, AV_LOG_ERROR,
yading@10:                        "Mismatching channel count %d and layout '%s' "
yading@10:                        "(%d channels)\n",
yading@10:                        s->channels, s->channel_layout_str, n);
yading@10:                 return AVERROR(EINVAL);
yading@10:             }
yading@10:         }
yading@10:         s->channels = n;
yading@10:     } else if (!s->channels) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
yading@10:                                   "channel layout specified\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     if (!s->time_base.num)
yading@10:         s->time_base = (AVRational){1, s->sample_rate};
yading@10: 
yading@10:     av_log(ctx, AV_LOG_VERBOSE,
yading@10:            "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
yading@10:            s->time_base.num, s->time_base.den, s->sample_fmt_str,
yading@10:            s->sample_rate, s->channel_layout_str);
yading@10:     s->warning_limit = 100;
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static av_cold void uninit(AVFilterContext *ctx)
yading@10: {
yading@10:     BufferSourceContext *s = ctx->priv;
yading@10:     while (s->fifo && av_fifo_size(s->fifo)) {
yading@10:         AVFrame *frame;
yading@10:         av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
yading@10:         av_frame_free(&frame);
yading@10:     }
yading@10:     av_fifo_free(s->fifo);
yading@10:     s->fifo = NULL;
yading@10: }
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     BufferSourceContext *c = ctx->priv;
yading@10:     AVFilterChannelLayouts *channel_layouts = NULL;
yading@10:     AVFilterFormats *formats = NULL;
yading@10:     AVFilterFormats *samplerates = NULL;
yading@10: 
yading@10:     switch (ctx->outputs[0]->type) {
yading@10:     case AVMEDIA_TYPE_VIDEO:
yading@10:         ff_add_format(&formats, c->pix_fmt);
yading@10:         ff_set_common_formats(ctx, formats);
yading@10:         break;
yading@10:     case AVMEDIA_TYPE_AUDIO:
yading@10:         ff_add_format(&formats,           c->sample_fmt);
yading@10:         ff_set_common_formats(ctx, formats);
yading@10: 
yading@10:         ff_add_format(&samplerates,       c->sample_rate);
yading@10:         ff_set_common_samplerates(ctx, samplerates);
yading@10: 
yading@10:         ff_add_channel_layout(&channel_layouts,
yading@10:                               c->channel_layout ? c->channel_layout :
yading@10:                               FF_COUNT2LAYOUT(c->channels));
yading@10:         ff_set_common_channel_layouts(ctx, channel_layouts);
yading@10:         break;
yading@10:     default:
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int config_props(AVFilterLink *link)
yading@10: {
yading@10:     BufferSourceContext *c = link->src->priv;
yading@10: 
yading@10:     switch (link->type) {
yading@10:     case AVMEDIA_TYPE_VIDEO:
yading@10:         link->w = c->w;
yading@10:         link->h = c->h;
yading@10:         link->sample_aspect_ratio = c->pixel_aspect;
yading@10:         break;
yading@10:     case AVMEDIA_TYPE_AUDIO:
yading@10:         if (!c->channel_layout)
yading@10:             c->channel_layout = link->channel_layout;
yading@10:         break;
yading@10:     default:
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     link->time_base = c->time_base;
yading@10:     link->frame_rate = c->frame_rate;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int request_frame(AVFilterLink *link)
yading@10: {
yading@10:     BufferSourceContext *c = link->src->priv;
yading@10:     AVFrame *frame;
yading@10: 
yading@10:     if (!av_fifo_size(c->fifo)) {
yading@10:         if (c->eof)
yading@10:             return AVERROR_EOF;
yading@10:         c->nb_failed_requests++;
yading@10:         return AVERROR(EAGAIN);
yading@10:     }
yading@10:     av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
yading@10: 
yading@10:     return ff_filter_frame(link, frame);
yading@10: }
yading@10: 
yading@10: static int poll_frame(AVFilterLink *link)
yading@10: {
yading@10:     BufferSourceContext *c = link->src->priv;
yading@10:     int size = av_fifo_size(c->fifo);
yading@10:     if (!size && c->eof)
yading@10:         return AVERROR_EOF;
yading@10:     return size/sizeof(AVFrame*);
yading@10: }
yading@10: 
yading@10: static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
yading@10:     {
yading@10:         .name          = "default",
yading@10:         .type          = AVMEDIA_TYPE_VIDEO,
yading@10:         .request_frame = request_frame,
yading@10:         .poll_frame    = poll_frame,
yading@10:         .config_props  = config_props,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_vsrc_buffer = {
yading@10:     .name      = "buffer",
yading@10:     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
yading@10:     .priv_size = sizeof(BufferSourceContext),
yading@10:     .query_formats = query_formats,
yading@10: 
yading@10:     .init      = init_video,
yading@10:     .uninit    = uninit,
yading@10: 
yading@10:     .inputs    = NULL,
yading@10:     .outputs   = avfilter_vsrc_buffer_outputs,
yading@10:     .priv_class = &buffer_class,
yading@10: };
yading@10: 
yading@10: static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
yading@10:     {
yading@10:         .name          = "default",
yading@10:         .type          = AVMEDIA_TYPE_AUDIO,
yading@10:         .request_frame = request_frame,
yading@10:         .poll_frame    = poll_frame,
yading@10:         .config_props  = config_props,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_asrc_abuffer = {
yading@10:     .name          = "abuffer",
yading@10:     .description   = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
yading@10:     .priv_size     = sizeof(BufferSourceContext),
yading@10:     .query_formats = query_formats,
yading@10: 
yading@10:     .init      = init_audio,
yading@10:     .uninit    = uninit,
yading@10: 
yading@10:     .inputs    = NULL,
yading@10:     .outputs   = avfilter_asrc_abuffer_outputs,
yading@10:     .priv_class = &abuffer_class,
yading@10: };