LCOV - code coverage report
Current view: top level - libavfilter - buffersrc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 151 231 65.4 %
Date: 2017-12-17 04:34:43 Functions: 14 16 87.5 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2008 Vitor Sessak
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file
      23             :  * memory buffer source filter
      24             :  */
      25             : 
      26             : #include <float.h>
      27             : 
      28             : #include "libavutil/channel_layout.h"
      29             : #include "libavutil/common.h"
      30             : #include "libavutil/fifo.h"
      31             : #include "libavutil/frame.h"
      32             : #include "libavutil/imgutils.h"
      33             : #include "libavutil/internal.h"
      34             : #include "libavutil/opt.h"
      35             : #include "libavutil/samplefmt.h"
      36             : #include "audio.h"
      37             : #include "avfilter.h"
      38             : #include "buffersrc.h"
      39             : #include "formats.h"
      40             : #include "internal.h"
      41             : #include "video.h"
      42             : 
      43             : typedef struct BufferSourceContext {
      44             :     const AVClass    *class;
      45             :     AVFifoBuffer     *fifo;
      46             :     AVRational        time_base;     ///< time_base to set in the output link
      47             :     AVRational        frame_rate;    ///< frame_rate to set in the output link
      48             :     unsigned          nb_failed_requests;
      49             :     unsigned          warning_limit;
      50             : 
      51             :     /* video only */
      52             :     int               w, h;
      53             :     enum AVPixelFormat  pix_fmt;
      54             :     AVRational        pixel_aspect;
      55             :     char              *sws_param;
      56             : 
      57             :     AVBufferRef *hw_frames_ctx;
      58             : 
      59             :     /* audio only */
      60             :     int sample_rate;
      61             :     enum AVSampleFormat sample_fmt;
      62             :     int channels;
      63             :     uint64_t channel_layout;
      64             :     char    *channel_layout_str;
      65             : 
      66             :     int got_format_from_params;
      67             :     int eof;
      68             : } BufferSourceContext;
      69             : 
      70             : #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
      71             :     if (c->w != width || c->h != height || c->pix_fmt != format) {\
      72             :         av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\
      73             :     }
      74             : 
      75             : #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)\
      76             :     if (c->sample_fmt != format || c->sample_rate != srate ||\
      77             :         c->channel_layout != ch_layout || c->channels != ch_count) {\
      78             :         av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
      79             :         return AVERROR(EINVAL);\
      80             :     }
      81             : 
      82        4262 : AVBufferSrcParameters *av_buffersrc_parameters_alloc(void)
      83             : {
      84        4262 :     AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
      85        4262 :     if (!par)
      86           0 :         return NULL;
      87             : 
      88        4262 :     par->format = -1;
      89             : 
      90        4262 :     return par;
      91             : }
      92             : 
      93        4262 : int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
      94             : {
      95        4262 :     BufferSourceContext *s = ctx->priv;
      96             : 
      97        4262 :     if (param->time_base.num > 0 && param->time_base.den > 0)
      98           0 :         s->time_base = param->time_base;
      99             : 
     100        4262 :     switch (ctx->filter->outputs[0].type) {
     101        4262 :     case AVMEDIA_TYPE_VIDEO:
     102        4262 :         if (param->format != AV_PIX_FMT_NONE) {
     103           0 :             s->got_format_from_params = 1;
     104           0 :             s->pix_fmt = param->format;
     105             :         }
     106        4262 :         if (param->width > 0)
     107           0 :             s->w = param->width;
     108        4262 :         if (param->height > 0)
     109           0 :             s->h = param->height;
     110        4262 :         if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
     111           0 :             s->pixel_aspect = param->sample_aspect_ratio;
     112        4262 :         if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
     113           0 :             s->frame_rate = param->frame_rate;
     114        4262 :         if (param->hw_frames_ctx) {
     115           0 :             av_buffer_unref(&s->hw_frames_ctx);
     116           0 :             s->hw_frames_ctx = av_buffer_ref(param->hw_frames_ctx);
     117           0 :             if (!s->hw_frames_ctx)
     118           0 :                 return AVERROR(ENOMEM);
     119             :         }
     120        4262 :         break;
     121           0 :     case AVMEDIA_TYPE_AUDIO:
     122           0 :         if (param->format != AV_SAMPLE_FMT_NONE) {
     123           0 :             s->got_format_from_params = 1;
     124           0 :             s->sample_fmt = param->format;
     125             :         }
     126           0 :         if (param->sample_rate > 0)
     127           0 :             s->sample_rate = param->sample_rate;
     128           0 :         if (param->channel_layout)
     129           0 :             s->channel_layout = param->channel_layout;
     130           0 :         break;
     131           0 :     default:
     132           0 :         return AVERROR_BUG;
     133             :     }
     134             : 
     135        4262 :     return 0;
     136             : }
     137             : 
     138           0 : int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
     139             : {
     140           0 :     return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
     141             :                                         AV_BUFFERSRC_FLAG_KEEP_REF);
     142             : }
     143             : 
     144          21 : int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
     145             : {
     146          21 :     return av_buffersrc_add_frame_flags(ctx, frame, 0);
     147             : }
     148             : 
     149             : static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
     150             :                                            AVFrame *frame, int flags);
     151             : 
     152      381314 : int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
     153             : {
     154      381314 :     AVFrame *copy = NULL;
     155      381314 :     int ret = 0;
     156             : 
     157      664911 :     if (frame && frame->channel_layout &&
     158      283597 :         av_get_channel_layout_nb_channels(frame->channel_layout) != frame->channels) {
     159           0 :         av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
     160           0 :         return AVERROR(EINVAL);
     161             :     }
     162             : 
     163      381314 :     if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)
     164      380979 :         return av_buffersrc_add_frame_internal(ctx, frame, flags);
     165             : 
     166         335 :     if (!(copy = av_frame_alloc()))
     167           0 :         return AVERROR(ENOMEM);
     168         335 :     ret = av_frame_ref(copy, frame);
     169         335 :     if (ret >= 0)
     170         335 :         ret = av_buffersrc_add_frame_internal(ctx, copy, flags);
     171             : 
     172         335 :     av_frame_free(&copy);
     173         335 :     return ret;
     174             : }
     175             : 
     176     2851936 : static int push_frame(AVFilterGraph *graph)
     177             : {
     178             :     int ret;
     179             : 
     180             :     while (1) {
     181     5317295 :         ret = ff_filter_graph_run_once(graph);
     182     2851936 :         if (ret == AVERROR(EAGAIN))
     183      386577 :             break;
     184     2465359 :         if (ret < 0)
     185           0 :             return ret;
     186             :     }
     187      386577 :     return 0;
     188             : }
     189             : 
     190      381314 : static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
     191             :                                            AVFrame *frame, int flags)
     192             : {
     193      381314 :     BufferSourceContext *s = ctx->priv;
     194             :     AVFrame *copy;
     195             :     int refcounted, ret;
     196             : 
     197      381314 :     s->nb_failed_requests = 0;
     198             : 
     199      381314 :     if (!frame)
     200           2 :         return av_buffersrc_close(ctx, AV_NOPTS_VALUE, flags);
     201      381312 :     if (s->eof)
     202           0 :         return AVERROR(EINVAL);
     203             : 
     204      381312 :     refcounted = !!frame->buf[0];
     205             : 
     206      381312 :     if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
     207             : 
     208      381312 :     switch (ctx->outputs[0]->type) {
     209       96681 :     case AVMEDIA_TYPE_VIDEO:
     210       96681 :         CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
     211             :                                  frame->format);
     212       96681 :         break;
     213      284631 :     case AVMEDIA_TYPE_AUDIO:
     214             :         /* For layouts unknown on input but known on link after negotiation. */
     215      284631 :         if (!frame->channel_layout)
     216        1034 :             frame->channel_layout = s->channel_layout;
     217      284631 :         CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
     218             :                                  frame->channels, frame->format);
     219      284631 :         break;
     220           0 :     default:
     221           0 :         return AVERROR(EINVAL);
     222             :     }
     223             : 
     224           0 :     }
     225             : 
     226      381312 :     if (!av_fifo_space(s->fifo) &&
     227           0 :         (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
     228             :                                          sizeof(copy))) < 0)
     229           0 :         return ret;
     230             : 
     231      381312 :     if (!(copy = av_frame_alloc()))
     232           0 :         return AVERROR(ENOMEM);
     233             : 
     234      381312 :     if (refcounted) {
     235      381312 :         av_frame_move_ref(copy, frame);
     236             :     } else {
     237           0 :         ret = av_frame_ref(copy, frame);
     238           0 :         if (ret < 0) {
     239           0 :             av_frame_free(&copy);
     240           0 :             return ret;
     241             :         }
     242             :     }
     243             : 
     244      381312 :     if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {
     245           0 :         if (refcounted)
     246           0 :             av_frame_move_ref(frame, copy);
     247           0 :         av_frame_free(&copy);
     248           0 :         return ret;
     249             :     }
     250             : 
     251      381312 :     if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
     252           0 :         return ret;
     253             : 
     254      381312 :     if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
     255      381293 :         ret = push_frame(ctx->graph);
     256      381293 :         if (ret < 0)
     257           0 :             return ret;
     258             :     }
     259             : 
     260      381312 :     return 0;
     261             : }
     262             : 
     263        5286 : int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
     264             : {
     265        5286 :     BufferSourceContext *s = ctx->priv;
     266             : 
     267        5286 :     s->eof = 1;
     268        5286 :     ff_avfilter_link_set_in_status(ctx->outputs[0], AVERROR_EOF, pts);
     269        5286 :     return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;
     270             : }
     271             : 
     272        4262 : static av_cold int init_video(AVFilterContext *ctx)
     273             : {
     274        4262 :     BufferSourceContext *c = ctx->priv;
     275             : 
     276        8524 :     if (!(c->pix_fmt != AV_PIX_FMT_NONE || c->got_format_from_params) || !c->w || !c->h ||
     277        4262 :         av_q2d(c->time_base) <= 0) {
     278           0 :         av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
     279           0 :         return AVERROR(EINVAL);
     280             :     }
     281             : 
     282        4262 :     if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
     283           0 :         return AVERROR(ENOMEM);
     284             : 
     285        4262 :     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",
     286             :            c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
     287             :            c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
     288        4262 :            c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
     289        4262 :     c->warning_limit = 100;
     290        4262 :     return 0;
     291             : }
     292             : 
     293      366698 : unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
     294             : {
     295      366698 :     return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
     296             : }
     297             : 
     298             : #define OFFSET(x) offsetof(BufferSourceContext, x)
     299             : #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
     300             : #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
     301             : 
     302             : static const AVOption buffer_options[] = {
     303             :     { "width",         NULL,                     OFFSET(w),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
     304             :     { "video_size",    NULL,                     OFFSET(w),                AV_OPT_TYPE_IMAGE_SIZE,                .flags = V },
     305             :     { "height",        NULL,                     OFFSET(h),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
     306             :     { "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 },
     307             :     { "sar",           "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
     308             :     { "pixel_aspect",  "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
     309             :     { "time_base",     NULL,                     OFFSET(time_base),        AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
     310             :     { "frame_rate",    NULL,                     OFFSET(frame_rate),       AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
     311             :     { "sws_param",     NULL,                     OFFSET(sws_param),        AV_OPT_TYPE_STRING,                    .flags = V },
     312             :     { NULL },
     313             : };
     314             : 
     315             : AVFILTER_DEFINE_CLASS(buffer);
     316             : 
     317             : static const AVOption abuffer_options[] = {
     318             :     { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
     319             :     { "sample_rate",    NULL, OFFSET(sample_rate),         AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
     320             :     { "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 },
     321             :     { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },
     322             :     { "channels",       NULL, OFFSET(channels),            AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
     323             :     { NULL },
     324             : };
     325             : 
     326             : AVFILTER_DEFINE_CLASS(abuffer);
     327             : 
     328        1070 : static av_cold int init_audio(AVFilterContext *ctx)
     329             : {
     330        1070 :     BufferSourceContext *s = ctx->priv;
     331        1070 :     int ret = 0;
     332             : 
     333        1070 :     if (!(s->sample_fmt != AV_SAMPLE_FMT_NONE || s->got_format_from_params)) {
     334           0 :         av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
     335           0 :         return AVERROR(EINVAL);
     336             :     }
     337             : 
     338        2138 :     if (s->channel_layout_str || s->channel_layout) {
     339             :         int n;
     340             : 
     341        1068 :         if (!s->channel_layout) {
     342        1068 :             s->channel_layout = av_get_channel_layout(s->channel_layout_str);
     343        1068 :             if (!s->channel_layout) {
     344           0 :                 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
     345             :                        s->channel_layout_str);
     346           0 :                 return AVERROR(EINVAL);
     347             :             }
     348             :         }
     349        1068 :         n = av_get_channel_layout_nb_channels(s->channel_layout);
     350        1068 :         if (s->channels) {
     351           0 :             if (n != s->channels) {
     352           0 :                 av_log(ctx, AV_LOG_ERROR,
     353             :                        "Mismatching channel count %d and layout '%s' "
     354             :                        "(%d channels)\n",
     355             :                        s->channels, s->channel_layout_str, n);
     356           0 :                 return AVERROR(EINVAL);
     357             :             }
     358             :         }
     359        1068 :         s->channels = n;
     360           2 :     } else if (!s->channels) {
     361           0 :         av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
     362             :                                   "channel layout specified\n");
     363           0 :         return AVERROR(EINVAL);
     364             :     }
     365             : 
     366        1070 :     if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
     367           0 :         return AVERROR(ENOMEM);
     368             : 
     369        1070 :     if (!s->time_base.num)
     370           0 :         s->time_base = (AVRational){1, s->sample_rate};
     371             : 
     372        1070 :     av_log(ctx, AV_LOG_VERBOSE,
     373             :            "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
     374             :            s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),
     375             :            s->sample_rate, s->channel_layout_str);
     376        1070 :     s->warning_limit = 100;
     377             : 
     378        1070 :     return ret;
     379             : }
     380             : 
     381        5332 : static av_cold void uninit(AVFilterContext *ctx)
     382             : {
     383        5332 :     BufferSourceContext *s = ctx->priv;
     384       10664 :     while (s->fifo && av_fifo_size(s->fifo)) {
     385             :         AVFrame *frame;
     386           0 :         av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
     387           0 :         av_frame_free(&frame);
     388             :     }
     389        5332 :     av_buffer_unref(&s->hw_frames_ctx);
     390        5332 :     av_fifo_freep(&s->fifo);
     391        5332 : }
     392             : 
     393        5332 : static int query_formats(AVFilterContext *ctx)
     394             : {
     395        5332 :     BufferSourceContext *c = ctx->priv;
     396        5332 :     AVFilterChannelLayouts *channel_layouts = NULL;
     397        5332 :     AVFilterFormats *formats = NULL;
     398        5332 :     AVFilterFormats *samplerates = NULL;
     399             :     int ret;
     400             : 
     401        5332 :     switch (ctx->outputs[0]->type) {
     402        4262 :     case AVMEDIA_TYPE_VIDEO:
     403        8524 :         if ((ret = ff_add_format         (&formats, c->pix_fmt)) < 0 ||
     404        4262 :             (ret = ff_set_common_formats (ctx     , formats   )) < 0)
     405           0 :             return ret;
     406        4262 :         break;
     407        1070 :     case AVMEDIA_TYPE_AUDIO:
     408        2140 :         if ((ret = ff_add_format             (&formats    , c->sample_fmt )) < 0 ||
     409        2140 :             (ret = ff_set_common_formats     (ctx         , formats       )) < 0 ||
     410        2140 :             (ret = ff_add_format             (&samplerates, c->sample_rate)) < 0 ||
     411        1070 :             (ret = ff_set_common_samplerates (ctx         , samplerates   )) < 0)
     412           0 :             return ret;
     413             : 
     414        1072 :         if ((ret = ff_add_channel_layout(&channel_layouts,
     415        1070 :                               c->channel_layout ? c->channel_layout :
     416           2 :                               FF_COUNT2LAYOUT(c->channels))) < 0)
     417           0 :             return ret;
     418        1070 :         if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)
     419           0 :             return ret;
     420        1070 :         break;
     421           0 :     default:
     422           0 :         return AVERROR(EINVAL);
     423             :     }
     424             : 
     425        5332 :     return 0;
     426             : }
     427             : 
     428        5332 : static int config_props(AVFilterLink *link)
     429             : {
     430        5332 :     BufferSourceContext *c = link->src->priv;
     431             : 
     432        5332 :     switch (link->type) {
     433        4262 :     case AVMEDIA_TYPE_VIDEO:
     434        4262 :         link->w = c->w;
     435        4262 :         link->h = c->h;
     436        4262 :         link->sample_aspect_ratio = c->pixel_aspect;
     437             : 
     438        4262 :         if (c->hw_frames_ctx) {
     439           0 :             link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);
     440           0 :             if (!link->hw_frames_ctx)
     441           0 :                 return AVERROR(ENOMEM);
     442             :         }
     443        4262 :         break;
     444        1070 :     case AVMEDIA_TYPE_AUDIO:
     445        1070 :         if (!c->channel_layout)
     446           2 :             c->channel_layout = link->channel_layout;
     447        1070 :         break;
     448           0 :     default:
     449           0 :         return AVERROR(EINVAL);
     450             :     }
     451             : 
     452        5332 :     link->time_base = c->time_base;
     453        5332 :     link->frame_rate = c->frame_rate;
     454        5332 :     return 0;
     455             : }
     456             : 
     457      730948 : static int request_frame(AVFilterLink *link)
     458             : {
     459      730948 :     BufferSourceContext *c = link->src->priv;
     460             :     AVFrame *frame;
     461             :     int ret;
     462             : 
     463      730948 :     if (!av_fifo_size(c->fifo)) {
     464      349636 :         if (c->eof)
     465           0 :             return AVERROR_EOF;
     466      349636 :         c->nb_failed_requests++;
     467      349636 :         return AVERROR(EAGAIN);
     468             :     }
     469      381312 :     av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
     470             : 
     471      381312 :     ret = ff_filter_frame(link, frame);
     472             : 
     473      381312 :     return ret;
     474             : }
     475             : 
     476           0 : static int poll_frame(AVFilterLink *link)
     477             : {
     478           0 :     BufferSourceContext *c = link->src->priv;
     479           0 :     int size = av_fifo_size(c->fifo);
     480           0 :     if (!size && c->eof)
     481           0 :         return AVERROR_EOF;
     482           0 :     return size/sizeof(AVFrame*);
     483             : }
     484             : 
     485             : static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
     486             :     {
     487             :         .name          = "default",
     488             :         .type          = AVMEDIA_TYPE_VIDEO,
     489             :         .request_frame = request_frame,
     490             :         .poll_frame    = poll_frame,
     491             :         .config_props  = config_props,
     492             :     },
     493             :     { NULL }
     494             : };
     495             : 
     496             : AVFilter ff_vsrc_buffer = {
     497             :     .name      = "buffer",
     498             :     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
     499             :     .priv_size = sizeof(BufferSourceContext),
     500             :     .query_formats = query_formats,
     501             : 
     502             :     .init      = init_video,
     503             :     .uninit    = uninit,
     504             : 
     505             :     .inputs    = NULL,
     506             :     .outputs   = avfilter_vsrc_buffer_outputs,
     507             :     .priv_class = &buffer_class,
     508             : };
     509             : 
     510             : static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
     511             :     {
     512             :         .name          = "default",
     513             :         .type          = AVMEDIA_TYPE_AUDIO,
     514             :         .request_frame = request_frame,
     515             :         .poll_frame    = poll_frame,
     516             :         .config_props  = config_props,
     517             :     },
     518             :     { NULL }
     519             : };
     520             : 
     521             : AVFilter ff_asrc_abuffer = {
     522             :     .name          = "abuffer",
     523             :     .description   = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
     524             :     .priv_size     = sizeof(BufferSourceContext),
     525             :     .query_formats = query_formats,
     526             : 
     527             :     .init      = init_audio,
     528             :     .uninit    = uninit,
     529             : 
     530             :     .inputs    = NULL,
     531             :     .outputs   = avfilter_asrc_abuffer_outputs,
     532             :     .priv_class = &abuffer_class,
     533             : };

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