LCOV - code coverage report
Current view: top level - src/libavfilter - buffersrc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 151 231 65.4 %
Date: 2017-09-22 00:04:37 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        4183 : AVBufferSrcParameters *av_buffersrc_parameters_alloc(void)
      83             : {
      84        4183 :     AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
      85        4183 :     if (!par)
      86           0 :         return NULL;
      87             : 
      88        4183 :     par->format = -1;
      89             : 
      90        4183 :     return par;
      91             : }
      92             : 
      93        4183 : int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
      94             : {
      95        4183 :     BufferSourceContext *s = ctx->priv;
      96             : 
      97        4183 :     if (param->time_base.num > 0 && param->time_base.den > 0)
      98           0 :         s->time_base = param->time_base;
      99             : 
     100        4183 :     switch (ctx->filter->outputs[0].type) {
     101        4183 :     case AVMEDIA_TYPE_VIDEO:
     102        4183 :         if (param->format != AV_PIX_FMT_NONE) {
     103           0 :             s->got_format_from_params = 1;
     104           0 :             s->pix_fmt = param->format;
     105             :         }
     106        4183 :         if (param->width > 0)
     107           0 :             s->w = param->width;
     108        4183 :         if (param->height > 0)
     109           0 :             s->h = param->height;
     110        4183 :         if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
     111           0 :             s->pixel_aspect = param->sample_aspect_ratio;
     112        4183 :         if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
     113           0 :             s->frame_rate = param->frame_rate;
     114        4183 :         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        4183 :         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        4183 :     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      379983 : int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
     153             : {
     154      379983 :     AVFrame *copy = NULL;
     155      379983 :     int ret = 0;
     156             : 
     157      663222 :     if (frame && frame->channel_layout &&
     158      283239 :         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      379983 :     if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)
     164      379648 :         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     2827817 : static int push_frame(AVFilterGraph *graph)
     177             : {
     178             :     int ret;
     179             : 
     180             :     while (1) {
     181     5270470 :         ret = ff_filter_graph_run_once(graph);
     182     2827817 :         if (ret == AVERROR(EAGAIN))
     183      385164 :             break;
     184     2442653 :         if (ret < 0)
     185           0 :             return ret;
     186             :     }
     187      385164 :     return 0;
     188             : }
     189             : 
     190      379983 : static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
     191             :                                            AVFrame *frame, int flags)
     192             : {
     193      379983 :     BufferSourceContext *s = ctx->priv;
     194             :     AVFrame *copy;
     195             :     int refcounted, ret;
     196             : 
     197      379983 :     s->nb_failed_requests = 0;
     198             : 
     199      379983 :     if (!frame)
     200           2 :         return av_buffersrc_close(ctx, AV_NOPTS_VALUE, flags);
     201      379981 :     if (s->eof)
     202           0 :         return AVERROR(EINVAL);
     203             : 
     204      379981 :     refcounted = !!frame->buf[0];
     205             : 
     206      379981 :     if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
     207             : 
     208      379981 :     switch (ctx->outputs[0]->type) {
     209       95708 :     case AVMEDIA_TYPE_VIDEO:
     210       95708 :         CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
     211             :                                  frame->format);
     212       95708 :         break;
     213      284273 :     case AVMEDIA_TYPE_AUDIO:
     214             :         /* For layouts unknown on input but known on link after negotiation. */
     215      284273 :         if (!frame->channel_layout)
     216        1034 :             frame->channel_layout = s->channel_layout;
     217      284273 :         CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
     218             :                                  frame->channels, frame->format);
     219      284273 :         break;
     220           0 :     default:
     221           0 :         return AVERROR(EINVAL);
     222             :     }
     223             : 
     224           0 :     }
     225             : 
     226      379981 :     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      379981 :     if (!(copy = av_frame_alloc()))
     232           0 :         return AVERROR(ENOMEM);
     233             : 
     234      379981 :     if (refcounted) {
     235      379981 :         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      379981 :     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      379981 :     if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
     252           0 :         return ret;
     253             : 
     254      379981 :     if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
     255      379962 :         ret = push_frame(ctx->graph);
     256      379962 :         if (ret < 0)
     257           0 :             return ret;
     258             :     }
     259             : 
     260      379981 :     return 0;
     261             : }
     262             : 
     263        5204 : int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
     264             : {
     265        5204 :     BufferSourceContext *s = ctx->priv;
     266             : 
     267        5204 :     s->eof = 1;
     268        5204 :     ff_avfilter_link_set_in_status(ctx->outputs[0], AVERROR_EOF, pts);
     269        5204 :     return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;
     270             : }
     271             : 
     272        4183 : static av_cold int init_video(AVFilterContext *ctx)
     273             : {
     274        4183 :     BufferSourceContext *c = ctx->priv;
     275             : 
     276        8366 :     if (!(c->pix_fmt != AV_PIX_FMT_NONE || c->got_format_from_params) || !c->w || !c->h ||
     277        4183 :         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        4183 :     if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
     283           0 :         return AVERROR(ENOMEM);
     284             : 
     285        4183 :     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        4183 :            c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
     289        4183 :     c->warning_limit = 100;
     290        4183 :     return 0;
     291             : }
     292             : 
     293      365348 : unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
     294             : {
     295      365348 :     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             : #if FF_API_OLD_FILTER_OPTS
     308             :     /* those 4 are for compatibility with the old option passing system where each filter
     309             :      * did its own parsing */
     310             :     { "time_base_num", "deprecated, do not use", OFFSET(time_base.num),    AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
     311             :     { "time_base_den", "deprecated, do not use", OFFSET(time_base.den),    AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
     312             :     { "sar_num",       "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
     313             :     { "sar_den",       "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
     314             : #endif
     315             :     { "sar",           "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
     316             :     { "pixel_aspect",  "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
     317             :     { "time_base",     NULL,                     OFFSET(time_base),        AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
     318             :     { "frame_rate",    NULL,                     OFFSET(frame_rate),       AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
     319             :     { "sws_param",     NULL,                     OFFSET(sws_param),        AV_OPT_TYPE_STRING,                    .flags = V },
     320             :     { NULL },
     321             : };
     322             : 
     323             : AVFILTER_DEFINE_CLASS(buffer);
     324             : 
     325             : static const AVOption abuffer_options[] = {
     326             :     { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
     327             :     { "sample_rate",    NULL, OFFSET(sample_rate),         AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
     328             :     { "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 },
     329             :     { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },
     330             :     { "channels",       NULL, OFFSET(channels),            AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
     331             :     { NULL },
     332             : };
     333             : 
     334             : AVFILTER_DEFINE_CLASS(abuffer);
     335             : 
     336        1067 : static av_cold int init_audio(AVFilterContext *ctx)
     337             : {
     338        1067 :     BufferSourceContext *s = ctx->priv;
     339        1067 :     int ret = 0;
     340             : 
     341        1067 :     if (!(s->sample_fmt != AV_SAMPLE_FMT_NONE || s->got_format_from_params)) {
     342           0 :         av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
     343           0 :         return AVERROR(EINVAL);
     344             :     }
     345             : 
     346        2132 :     if (s->channel_layout_str || s->channel_layout) {
     347             :         int n;
     348             : 
     349        1065 :         if (!s->channel_layout) {
     350        1065 :             s->channel_layout = av_get_channel_layout(s->channel_layout_str);
     351        1065 :             if (!s->channel_layout) {
     352           0 :                 av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
     353             :                        s->channel_layout_str);
     354           0 :                 return AVERROR(EINVAL);
     355             :             }
     356             :         }
     357        1065 :         n = av_get_channel_layout_nb_channels(s->channel_layout);
     358        1065 :         if (s->channels) {
     359           0 :             if (n != s->channels) {
     360           0 :                 av_log(ctx, AV_LOG_ERROR,
     361             :                        "Mismatching channel count %d and layout '%s' "
     362             :                        "(%d channels)\n",
     363             :                        s->channels, s->channel_layout_str, n);
     364           0 :                 return AVERROR(EINVAL);
     365             :             }
     366             :         }
     367        1065 :         s->channels = n;
     368           2 :     } else if (!s->channels) {
     369           0 :         av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
     370             :                                   "channel layout specified\n");
     371           0 :         return AVERROR(EINVAL);
     372             :     }
     373             : 
     374        1067 :     if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
     375           0 :         return AVERROR(ENOMEM);
     376             : 
     377        1067 :     if (!s->time_base.num)
     378           0 :         s->time_base = (AVRational){1, s->sample_rate};
     379             : 
     380        1067 :     av_log(ctx, AV_LOG_VERBOSE,
     381             :            "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
     382             :            s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),
     383             :            s->sample_rate, s->channel_layout_str);
     384        1067 :     s->warning_limit = 100;
     385             : 
     386        1067 :     return ret;
     387             : }
     388             : 
     389        5250 : static av_cold void uninit(AVFilterContext *ctx)
     390             : {
     391        5250 :     BufferSourceContext *s = ctx->priv;
     392       10500 :     while (s->fifo && av_fifo_size(s->fifo)) {
     393             :         AVFrame *frame;
     394           0 :         av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
     395           0 :         av_frame_free(&frame);
     396             :     }
     397        5250 :     av_buffer_unref(&s->hw_frames_ctx);
     398        5250 :     av_fifo_freep(&s->fifo);
     399        5250 : }
     400             : 
     401        5250 : static int query_formats(AVFilterContext *ctx)
     402             : {
     403        5250 :     BufferSourceContext *c = ctx->priv;
     404        5250 :     AVFilterChannelLayouts *channel_layouts = NULL;
     405        5250 :     AVFilterFormats *formats = NULL;
     406        5250 :     AVFilterFormats *samplerates = NULL;
     407             :     int ret;
     408             : 
     409        5250 :     switch (ctx->outputs[0]->type) {
     410        4183 :     case AVMEDIA_TYPE_VIDEO:
     411        8366 :         if ((ret = ff_add_format         (&formats, c->pix_fmt)) < 0 ||
     412        4183 :             (ret = ff_set_common_formats (ctx     , formats   )) < 0)
     413           0 :             return ret;
     414        4183 :         break;
     415        1067 :     case AVMEDIA_TYPE_AUDIO:
     416        2134 :         if ((ret = ff_add_format             (&formats    , c->sample_fmt )) < 0 ||
     417        2134 :             (ret = ff_set_common_formats     (ctx         , formats       )) < 0 ||
     418        2134 :             (ret = ff_add_format             (&samplerates, c->sample_rate)) < 0 ||
     419        1067 :             (ret = ff_set_common_samplerates (ctx         , samplerates   )) < 0)
     420           0 :             return ret;
     421             : 
     422        1069 :         if ((ret = ff_add_channel_layout(&channel_layouts,
     423        1067 :                               c->channel_layout ? c->channel_layout :
     424           2 :                               FF_COUNT2LAYOUT(c->channels))) < 0)
     425           0 :             return ret;
     426        1067 :         if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)
     427           0 :             return ret;
     428        1067 :         break;
     429           0 :     default:
     430           0 :         return AVERROR(EINVAL);
     431             :     }
     432             : 
     433        5250 :     return 0;
     434             : }
     435             : 
     436        5250 : static int config_props(AVFilterLink *link)
     437             : {
     438        5250 :     BufferSourceContext *c = link->src->priv;
     439             : 
     440        5250 :     switch (link->type) {
     441        4183 :     case AVMEDIA_TYPE_VIDEO:
     442        4183 :         link->w = c->w;
     443        4183 :         link->h = c->h;
     444        4183 :         link->sample_aspect_ratio = c->pixel_aspect;
     445             : 
     446        4183 :         if (c->hw_frames_ctx) {
     447           0 :             link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);
     448           0 :             if (!link->hw_frames_ctx)
     449           0 :                 return AVERROR(ENOMEM);
     450             :         }
     451        4183 :         break;
     452        1067 :     case AVMEDIA_TYPE_AUDIO:
     453        1067 :         if (!c->channel_layout)
     454           2 :             c->channel_layout = link->channel_layout;
     455        1067 :         break;
     456           0 :     default:
     457           0 :         return AVERROR(EINVAL);
     458             :     }
     459             : 
     460        5250 :     link->time_base = c->time_base;
     461        5250 :     link->frame_rate = c->frame_rate;
     462        5250 :     return 0;
     463             : }
     464             : 
     465      728684 : static int request_frame(AVFilterLink *link)
     466             : {
     467      728684 :     BufferSourceContext *c = link->src->priv;
     468             :     AVFrame *frame;
     469             :     int ret;
     470             : 
     471      728684 :     if (!av_fifo_size(c->fifo)) {
     472      348703 :         if (c->eof)
     473           0 :             return AVERROR_EOF;
     474      348703 :         c->nb_failed_requests++;
     475      348703 :         return AVERROR(EAGAIN);
     476             :     }
     477      379981 :     av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
     478             : 
     479      379981 :     ret = ff_filter_frame(link, frame);
     480             : 
     481      379981 :     return ret;
     482             : }
     483             : 
     484           0 : static int poll_frame(AVFilterLink *link)
     485             : {
     486           0 :     BufferSourceContext *c = link->src->priv;
     487           0 :     int size = av_fifo_size(c->fifo);
     488           0 :     if (!size && c->eof)
     489           0 :         return AVERROR_EOF;
     490           0 :     return size/sizeof(AVFrame*);
     491             : }
     492             : 
     493             : static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
     494             :     {
     495             :         .name          = "default",
     496             :         .type          = AVMEDIA_TYPE_VIDEO,
     497             :         .request_frame = request_frame,
     498             :         .poll_frame    = poll_frame,
     499             :         .config_props  = config_props,
     500             :     },
     501             :     { NULL }
     502             : };
     503             : 
     504             : AVFilter ff_vsrc_buffer = {
     505             :     .name      = "buffer",
     506             :     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
     507             :     .priv_size = sizeof(BufferSourceContext),
     508             :     .query_formats = query_formats,
     509             : 
     510             :     .init      = init_video,
     511             :     .uninit    = uninit,
     512             : 
     513             :     .inputs    = NULL,
     514             :     .outputs   = avfilter_vsrc_buffer_outputs,
     515             :     .priv_class = &buffer_class,
     516             : };
     517             : 
     518             : static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
     519             :     {
     520             :         .name          = "default",
     521             :         .type          = AVMEDIA_TYPE_AUDIO,
     522             :         .request_frame = request_frame,
     523             :         .poll_frame    = poll_frame,
     524             :         .config_props  = config_props,
     525             :     },
     526             :     { NULL }
     527             : };
     528             : 
     529             : AVFilter ff_asrc_abuffer = {
     530             :     .name          = "abuffer",
     531             :     .description   = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
     532             :     .priv_size     = sizeof(BufferSourceContext),
     533             :     .query_formats = query_formats,
     534             : 
     535             :     .init      = init_audio,
     536             :     .uninit    = uninit,
     537             : 
     538             :     .inputs    = NULL,
     539             :     .outputs   = avfilter_asrc_abuffer_outputs,
     540             :     .priv_class = &abuffer_class,
     541             : };

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