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  1. /*
  2.  * Copyright (c) 2010 Stefano Sabatini
  3.  * Copyright (c) 2008 Victor Paesa
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * movie video source
  25.  *
  26.  * @todo use direct rendering (no allocation of a new frame)
  27.  * @todo support a PTS correction mechanism
  28.  */
  29.  
  30. #include <float.h>
  31. #include <stdint.h>
  32.  
  33. #include "libavutil/attributes.h"
  34. #include "libavutil/avstring.h"
  35. #include "libavutil/avassert.h"
  36. #include "libavutil/opt.h"
  37. #include "libavutil/imgutils.h"
  38. #include "libavutil/internal.h"
  39. #include "libavutil/timestamp.h"
  40. #include "libavformat/avformat.h"
  41. #include "audio.h"
  42. #include "avcodec.h"
  43. #include "avfilter.h"
  44. #include "formats.h"
  45. #include "internal.h"
  46. #include "video.h"
  47.  
  48. typedef struct MovieStream {
  49.     AVStream *st;
  50.     int done;
  51. } MovieStream;
  52.  
  53. typedef struct MovieContext {
  54.     /* common A/V fields */
  55.     const AVClass *class;
  56.     int64_t seek_point;   ///< seekpoint in microseconds
  57.     double seek_point_d;
  58.     char *format_name;
  59.     char *file_name;
  60.     char *stream_specs; /**< user-provided list of streams, separated by + */
  61.     int stream_index; /**< for compatibility */
  62.     int loop_count;
  63.  
  64.     AVFormatContext *format_ctx;
  65.     int eof;
  66.     AVPacket pkt, pkt0;
  67.  
  68.     int max_stream_index; /**< max stream # actually used for output */
  69.     MovieStream *st; /**< array of all streams, one per output */
  70.     int *out_index; /**< stream number -> output number map, or -1 */
  71. } MovieContext;
  72.  
  73. #define OFFSET(x) offsetof(MovieContext, x)
  74. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM
  75.  
  76. static const AVOption movie_options[]= {
  77.     { "filename",     NULL,                      OFFSET(file_name),    AV_OPT_TYPE_STRING,                                    .flags = FLAGS },
  78.     { "format_name",  "set format name",         OFFSET(format_name),  AV_OPT_TYPE_STRING,                                    .flags = FLAGS },
  79.     { "f",            "set format name",         OFFSET(format_name),  AV_OPT_TYPE_STRING,                                    .flags = FLAGS },
  80.     { "stream_index", "set stream index",        OFFSET(stream_index), AV_OPT_TYPE_INT,    { .i64 = -1 }, -1, INT_MAX,                 FLAGS  },
  81.     { "si",           "set stream index",        OFFSET(stream_index), AV_OPT_TYPE_INT,    { .i64 = -1 }, -1, INT_MAX,                 FLAGS  },
  82.     { "seek_point",   "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl =  0 },  0, (INT64_MAX-1) / 1000000, FLAGS },
  83.     { "sp",           "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl =  0 },  0, (INT64_MAX-1) / 1000000, FLAGS },
  84.     { "streams",      "set streams",             OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str =  0},  CHAR_MAX, CHAR_MAX, FLAGS },
  85.     { "s",            "set streams",             OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str =  0},  CHAR_MAX, CHAR_MAX, FLAGS },
  86.     { "loop",         "set loop count",          OFFSET(loop_count),   AV_OPT_TYPE_INT,    {.i64 =  1},  0,        INT_MAX, FLAGS },
  87.     { NULL },
  88. };
  89.  
  90. static int movie_config_output_props(AVFilterLink *outlink);
  91. static int movie_request_frame(AVFilterLink *outlink);
  92.  
  93. static AVStream *find_stream(void *log, AVFormatContext *avf, const char *spec)
  94. {
  95.     int i, ret, already = 0, stream_id = -1;
  96.     char type_char[2], dummy;
  97.     AVStream *found = NULL;
  98.     enum AVMediaType type;
  99.  
  100.     ret = sscanf(spec, "d%1[av]%d%c", type_char, &stream_id, &dummy);
  101.     if (ret >= 1 && ret <= 2) {
  102.         type = type_char[0] == 'v' ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
  103.         ret = av_find_best_stream(avf, type, stream_id, -1, NULL, 0);
  104.         if (ret < 0) {
  105.             av_log(log, AV_LOG_ERROR, "No %s stream with index '%d' found\n",
  106.                    av_get_media_type_string(type), stream_id);
  107.             return NULL;
  108.         }
  109.         return avf->streams[ret];
  110.     }
  111.     for (i = 0; i < avf->nb_streams; i++) {
  112.         ret = avformat_match_stream_specifier(avf, avf->streams[i], spec);
  113.         if (ret < 0) {
  114.             av_log(log, AV_LOG_ERROR,
  115.                    "Invalid stream specifier \"%s\"\n", spec);
  116.             return NULL;
  117.         }
  118.         if (!ret)
  119.             continue;
  120.         if (avf->streams[i]->discard != AVDISCARD_ALL) {
  121.             already++;
  122.             continue;
  123.         }
  124.         if (found) {
  125.             av_log(log, AV_LOG_WARNING,
  126.                    "Ambiguous stream specifier \"%s\", using #%d\n", spec, i);
  127.             break;
  128.         }
  129.         found = avf->streams[i];
  130.     }
  131.     if (!found) {
  132.         av_log(log, AV_LOG_WARNING, "Stream specifier \"%s\" %s\n", spec,
  133.                already ? "matched only already used streams" :
  134.                          "did not match any stream");
  135.         return NULL;
  136.     }
  137.     if (found->codec->codec_type != AVMEDIA_TYPE_VIDEO &&
  138.         found->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
  139.         av_log(log, AV_LOG_ERROR, "Stream specifier \"%s\" matched a %s stream,"
  140.                "currently unsupported by libavfilter\n", spec,
  141.                av_get_media_type_string(found->codec->codec_type));
  142.         return NULL;
  143.     }
  144.     return found;
  145. }
  146.  
  147. static int open_stream(void *log, MovieStream *st)
  148. {
  149.     AVCodec *codec;
  150.     int ret;
  151.  
  152.     codec = avcodec_find_decoder(st->st->codec->codec_id);
  153.     if (!codec) {
  154.         av_log(log, AV_LOG_ERROR, "Failed to find any codec\n");
  155.         return AVERROR(EINVAL);
  156.     }
  157.  
  158.     st->st->codec->refcounted_frames = 1;
  159.  
  160.     if ((ret = avcodec_open2(st->st->codec, codec, NULL)) < 0) {
  161.         av_log(log, AV_LOG_ERROR, "Failed to open codec\n");
  162.         return ret;
  163.     }
  164.  
  165.     return 0;
  166. }
  167.  
  168. static int guess_channel_layout(MovieStream *st, int st_index, void *log_ctx)
  169. {
  170.     AVCodecContext *dec_ctx = st->st->codec;
  171.     char buf[256];
  172.     int64_t chl = av_get_default_channel_layout(dec_ctx->channels);
  173.  
  174.     if (!chl) {
  175.         av_log(log_ctx, AV_LOG_ERROR,
  176.                "Channel layout is not set in stream %d, and could not "
  177.                "be guessed from the number of channels (%d)\n",
  178.                st_index, dec_ctx->channels);
  179.         return AVERROR(EINVAL);
  180.     }
  181.  
  182.     av_get_channel_layout_string(buf, sizeof(buf), dec_ctx->channels, chl);
  183.     av_log(log_ctx, AV_LOG_WARNING,
  184.            "Channel layout is not set in output stream %d, "
  185.            "guessed channel layout is '%s'\n",
  186.            st_index, buf);
  187.     dec_ctx->channel_layout = chl;
  188.     return 0;
  189. }
  190.  
  191. static av_cold int movie_common_init(AVFilterContext *ctx)
  192. {
  193.     MovieContext *movie = ctx->priv;
  194.     AVInputFormat *iformat = NULL;
  195.     int64_t timestamp;
  196.     int nb_streams = 1, ret, i;
  197.     char default_streams[16], *stream_specs, *spec, *cursor;
  198.     char name[16];
  199.     AVStream *st;
  200.  
  201.     if (!movie->file_name) {
  202.         av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
  203.         return AVERROR(EINVAL);
  204.     }
  205.  
  206.     movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
  207.  
  208.     stream_specs = movie->stream_specs;
  209.     if (!stream_specs) {
  210.         snprintf(default_streams, sizeof(default_streams), "d%c%d",
  211.                  !strcmp(ctx->filter->name, "amovie") ? 'a' : 'v',
  212.                  movie->stream_index);
  213.         stream_specs = default_streams;
  214.     }
  215.     for (cursor = stream_specs; *cursor; cursor++)
  216.         if (*cursor == '+')
  217.             nb_streams++;
  218.  
  219.     if (movie->loop_count != 1 && nb_streams != 1) {
  220.         av_log(ctx, AV_LOG_ERROR,
  221.                "Loop with several streams is currently unsupported\n");
  222.         return AVERROR_PATCHWELCOME;
  223.     }
  224.  
  225.     av_register_all();
  226.  
  227.     // Try to find the movie format (container)
  228.     iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;
  229.  
  230.     movie->format_ctx = NULL;
  231.     if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {
  232.         av_log(ctx, AV_LOG_ERROR,
  233.                "Failed to avformat_open_input '%s'\n", movie->file_name);
  234.         return ret;
  235.     }
  236.     if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
  237.         av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");
  238.  
  239.     // if seeking requested, we execute it
  240.     if (movie->seek_point > 0) {
  241.         timestamp = movie->seek_point;
  242.         // add the stream start time, should it exist
  243.         if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
  244.             if (timestamp > INT64_MAX - movie->format_ctx->start_time) {
  245.                 av_log(ctx, AV_LOG_ERROR,
  246.                        "%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
  247.                        movie->file_name, movie->format_ctx->start_time, movie->seek_point);
  248.                 return AVERROR(EINVAL);
  249.             }
  250.             timestamp += movie->format_ctx->start_time;
  251.         }
  252.         if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
  253.             av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
  254.                    movie->file_name, timestamp);
  255.             return ret;
  256.         }
  257.     }
  258.  
  259.     for (i = 0; i < movie->format_ctx->nb_streams; i++)
  260.         movie->format_ctx->streams[i]->discard = AVDISCARD_ALL;
  261.  
  262.     movie->st = av_calloc(nb_streams, sizeof(*movie->st));
  263.     if (!movie->st)
  264.         return AVERROR(ENOMEM);
  265.  
  266.     for (i = 0; i < nb_streams; i++) {
  267.         spec = av_strtok(stream_specs, "+", &cursor);
  268.         if (!spec)
  269.             return AVERROR_BUG;
  270.         stream_specs = NULL; /* for next strtok */
  271.         st = find_stream(ctx, movie->format_ctx, spec);
  272.         if (!st)
  273.             return AVERROR(EINVAL);
  274.         st->discard = AVDISCARD_DEFAULT;
  275.         movie->st[i].st = st;
  276.         movie->max_stream_index = FFMAX(movie->max_stream_index, st->index);
  277.     }
  278.     if (av_strtok(NULL, "+", &cursor))
  279.         return AVERROR_BUG;
  280.  
  281.     movie->out_index = av_calloc(movie->max_stream_index + 1,
  282.                                  sizeof(*movie->out_index));
  283.     if (!movie->out_index)
  284.         return AVERROR(ENOMEM);
  285.     for (i = 0; i <= movie->max_stream_index; i++)
  286.         movie->out_index[i] = -1;
  287.     for (i = 0; i < nb_streams; i++) {
  288.         AVFilterPad pad = { 0 };
  289.         movie->out_index[movie->st[i].st->index] = i;
  290.         snprintf(name, sizeof(name), "out%d", i);
  291.         pad.type          = movie->st[i].st->codec->codec_type;
  292.         pad.name          = av_strdup(name);
  293.         if (!pad.name)
  294.             return AVERROR(ENOMEM);
  295.         pad.config_props  = movie_config_output_props;
  296.         pad.request_frame = movie_request_frame;
  297.         ff_insert_outpad(ctx, i, &pad);
  298.         ret = open_stream(ctx, &movie->st[i]);
  299.         if (ret < 0)
  300.             return ret;
  301.         if ( movie->st[i].st->codec->codec->type == AVMEDIA_TYPE_AUDIO &&
  302.             !movie->st[i].st->codec->channel_layout) {
  303.             ret = guess_channel_layout(&movie->st[i], i, ctx);
  304.             if (ret < 0)
  305.                 return ret;
  306.         }
  307.     }
  308.  
  309.     av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
  310.            movie->seek_point, movie->format_name, movie->file_name,
  311.            movie->stream_index);
  312.  
  313.     return 0;
  314. }
  315.  
  316. static av_cold void movie_uninit(AVFilterContext *ctx)
  317. {
  318.     MovieContext *movie = ctx->priv;
  319.     int i;
  320.  
  321.     for (i = 0; i < ctx->nb_outputs; i++) {
  322.         av_freep(&ctx->output_pads[i].name);
  323.         if (movie->st[i].st)
  324.             avcodec_close(movie->st[i].st->codec);
  325.     }
  326.     av_freep(&movie->st);
  327.     av_freep(&movie->out_index);
  328.     if (movie->format_ctx)
  329.         avformat_close_input(&movie->format_ctx);
  330. }
  331.  
  332. static int movie_query_formats(AVFilterContext *ctx)
  333. {
  334.     MovieContext *movie = ctx->priv;
  335.     int list[] = { 0, -1 };
  336.     int64_t list64[] = { 0, -1 };
  337.     int i;
  338.  
  339.     for (i = 0; i < ctx->nb_outputs; i++) {
  340.         MovieStream *st = &movie->st[i];
  341.         AVCodecContext *c = st->st->codec;
  342.         AVFilterLink *outlink = ctx->outputs[i];
  343.  
  344.         switch (c->codec_type) {
  345.         case AVMEDIA_TYPE_VIDEO:
  346.             list[0] = c->pix_fmt;
  347.             ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);
  348.             break;
  349.         case AVMEDIA_TYPE_AUDIO:
  350.             list[0] = c->sample_fmt;
  351.             ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);
  352.             list[0] = c->sample_rate;
  353.             ff_formats_ref(ff_make_format_list(list), &outlink->in_samplerates);
  354.             list64[0] = c->channel_layout;
  355.             ff_channel_layouts_ref(avfilter_make_format64_list(list64),
  356.                                    &outlink->in_channel_layouts);
  357.             break;
  358.         }
  359.     }
  360.  
  361.     return 0;
  362. }
  363.  
  364. static int movie_config_output_props(AVFilterLink *outlink)
  365. {
  366.     AVFilterContext *ctx = outlink->src;
  367.     MovieContext *movie  = ctx->priv;
  368.     unsigned out_id = FF_OUTLINK_IDX(outlink);
  369.     MovieStream *st = &movie->st[out_id];
  370.     AVCodecContext *c = st->st->codec;
  371.  
  372.     outlink->time_base = st->st->time_base;
  373.  
  374.     switch (c->codec_type) {
  375.     case AVMEDIA_TYPE_VIDEO:
  376.         outlink->w          = c->width;
  377.         outlink->h          = c->height;
  378.         outlink->frame_rate = st->st->r_frame_rate;
  379.         break;
  380.     case AVMEDIA_TYPE_AUDIO:
  381.         break;
  382.     }
  383.  
  384.     return 0;
  385. }
  386.  
  387. static char *describe_frame_to_str(char *dst, size_t dst_size,
  388.                                    AVFrame *frame, enum AVMediaType frame_type,
  389.                                    AVFilterLink *link)
  390. {
  391.     switch (frame_type) {
  392.     case AVMEDIA_TYPE_VIDEO:
  393.         snprintf(dst, dst_size,
  394.                  "video pts:%s time:%s size:%dx%d aspect:%d/%d",
  395.                  av_ts2str(frame->pts), av_ts2timestr(frame->pts, &link->time_base),
  396.                  frame->width, frame->height,
  397.                  frame->sample_aspect_ratio.num,
  398.                  frame->sample_aspect_ratio.den);
  399.                  break;
  400.     case AVMEDIA_TYPE_AUDIO:
  401.         snprintf(dst, dst_size,
  402.                  "audio pts:%s time:%s samples:%d",
  403.                  av_ts2str(frame->pts), av_ts2timestr(frame->pts, &link->time_base),
  404.                  frame->nb_samples);
  405.                  break;
  406.     default:
  407.         snprintf(dst, dst_size, "%s BUG", av_get_media_type_string(frame_type));
  408.         break;
  409.     }
  410.     return dst;
  411. }
  412.  
  413. static int rewind_file(AVFilterContext *ctx)
  414. {
  415.     MovieContext *movie = ctx->priv;
  416.     int64_t timestamp = movie->seek_point;
  417.     int ret, i;
  418.  
  419.     if (movie->format_ctx->start_time != AV_NOPTS_VALUE)
  420.         timestamp += movie->format_ctx->start_time;
  421.     ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD);
  422.     if (ret < 0) {
  423.         av_log(ctx, AV_LOG_ERROR, "Unable to loop: %s\n", av_err2str(ret));
  424.         movie->loop_count = 1; /* do not try again */
  425.         return ret;
  426.     }
  427.  
  428.     for (i = 0; i < ctx->nb_outputs; i++) {
  429.         avcodec_flush_buffers(movie->st[i].st->codec);
  430.         movie->st[i].done = 0;
  431.     }
  432.     movie->eof = 0;
  433.     return 0;
  434. }
  435.  
  436. /**
  437.  * Try to push a frame to the requested output.
  438.  *
  439.  * @param ctx     filter context
  440.  * @param out_id  number of output where a frame is wanted;
  441.  *                if the frame is read from file, used to set the return value;
  442.  *                if the codec is being flushed, flush the corresponding stream
  443.  * @return  1 if a frame was pushed on the requested output,
  444.  *          0 if another attempt is possible,
  445.  *          <0 AVERROR code
  446.  */
  447. static int movie_push_frame(AVFilterContext *ctx, unsigned out_id)
  448. {
  449.     MovieContext *movie = ctx->priv;
  450.     AVPacket *pkt = &movie->pkt;
  451.     enum AVMediaType frame_type;
  452.     MovieStream *st;
  453.     int ret, got_frame = 0, pkt_out_id;
  454.     AVFilterLink *outlink;
  455.     AVFrame *frame;
  456.  
  457.     if (!pkt->size) {
  458.         if (movie->eof) {
  459.             if (movie->st[out_id].done) {
  460.                 if (movie->loop_count != 1) {
  461.                     ret = rewind_file(ctx);
  462.                     if (ret < 0)
  463.                         return ret;
  464.                     movie->loop_count -= movie->loop_count > 1;
  465.                     av_log(ctx, AV_LOG_VERBOSE, "Stream finished, looping.\n");
  466.                     return 0; /* retry */
  467.                 }
  468.                 return AVERROR_EOF;
  469.             }
  470.             pkt->stream_index = movie->st[out_id].st->index;
  471.             /* packet is already ready for flushing */
  472.         } else {
  473.             ret = av_read_frame(movie->format_ctx, &movie->pkt0);
  474.             if (ret < 0) {
  475.                 av_init_packet(&movie->pkt0); /* ready for flushing */
  476.                 *pkt = movie->pkt0;
  477.                 if (ret == AVERROR_EOF) {
  478.                     movie->eof = 1;
  479.                     return 0; /* start flushing */
  480.                 }
  481.                 return ret;
  482.             }
  483.             *pkt = movie->pkt0;
  484.         }
  485.     }
  486.  
  487.     pkt_out_id = pkt->stream_index > movie->max_stream_index ? -1 :
  488.                  movie->out_index[pkt->stream_index];
  489.     if (pkt_out_id < 0) {
  490.         av_free_packet(&movie->pkt0);
  491.         pkt->size = 0; /* ready for next run */
  492.         pkt->data = NULL;
  493.         return 0;
  494.     }
  495.     st = &movie->st[pkt_out_id];
  496.     outlink = ctx->outputs[pkt_out_id];
  497.  
  498.     frame = av_frame_alloc();
  499.     if (!frame)
  500.         return AVERROR(ENOMEM);
  501.  
  502.     frame_type = st->st->codec->codec_type;
  503.     switch (frame_type) {
  504.     case AVMEDIA_TYPE_VIDEO:
  505.         ret = avcodec_decode_video2(st->st->codec, frame, &got_frame, pkt);
  506.         break;
  507.     case AVMEDIA_TYPE_AUDIO:
  508.         ret = avcodec_decode_audio4(st->st->codec, frame, &got_frame, pkt);
  509.         break;
  510.     default:
  511.         ret = AVERROR(ENOSYS);
  512.         break;
  513.     }
  514.     if (ret < 0) {
  515.         av_log(ctx, AV_LOG_WARNING, "Decode error: %s\n", av_err2str(ret));
  516.         av_frame_free(&frame);
  517.         av_free_packet(&movie->pkt0);
  518.         movie->pkt.size = 0;
  519.         movie->pkt.data = NULL;
  520.         return 0;
  521.     }
  522.     if (!ret || st->st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
  523.         ret = pkt->size;
  524.  
  525.     pkt->data += ret;
  526.     pkt->size -= ret;
  527.     if (pkt->size <= 0) {
  528.         av_free_packet(&movie->pkt0);
  529.         pkt->size = 0; /* ready for next run */
  530.         pkt->data = NULL;
  531.     }
  532.     if (!got_frame) {
  533.         if (!ret)
  534.             st->done = 1;
  535.         av_frame_free(&frame);
  536.         return 0;
  537.     }
  538.  
  539.     frame->pts = av_frame_get_best_effort_timestamp(frame);
  540.     ff_dlog(ctx, "movie_push_frame(): file:'%s' %s\n", movie->file_name,
  541.             describe_frame_to_str((char[1024]){0}, 1024, frame, frame_type, outlink));
  542.  
  543.     if (st->st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
  544.         if (frame->format != outlink->format) {
  545.             av_log(ctx, AV_LOG_ERROR, "Format changed %s -> %s, discarding frame\n",
  546.                 av_get_pix_fmt_name(outlink->format),
  547.                 av_get_pix_fmt_name(frame->format)
  548.                 );
  549.             av_frame_free(&frame);
  550.             return 0;
  551.         }
  552.     }
  553.     ret = ff_filter_frame(outlink, frame);
  554.  
  555.     if (ret < 0)
  556.         return ret;
  557.     return pkt_out_id == out_id;
  558. }
  559.  
  560. static int movie_request_frame(AVFilterLink *outlink)
  561. {
  562.     AVFilterContext *ctx = outlink->src;
  563.     unsigned out_id = FF_OUTLINK_IDX(outlink);
  564.     int ret;
  565.  
  566.     while (1) {
  567.         ret = movie_push_frame(ctx, out_id);
  568.         if (ret)
  569.             return FFMIN(ret, 0);
  570.     }
  571. }
  572.  
  573. #if CONFIG_MOVIE_FILTER
  574.  
  575. AVFILTER_DEFINE_CLASS(movie);
  576.  
  577. AVFilter ff_avsrc_movie = {
  578.     .name          = "movie",
  579.     .description   = NULL_IF_CONFIG_SMALL("Read from a movie source."),
  580.     .priv_size     = sizeof(MovieContext),
  581.     .priv_class    = &movie_class,
  582.     .init          = movie_common_init,
  583.     .uninit        = movie_uninit,
  584.     .query_formats = movie_query_formats,
  585.  
  586.     .inputs    = NULL,
  587.     .outputs   = NULL,
  588.     .flags     = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
  589. };
  590.  
  591. #endif  /* CONFIG_MOVIE_FILTER */
  592.  
  593. #if CONFIG_AMOVIE_FILTER
  594.  
  595. #define amovie_options movie_options
  596. AVFILTER_DEFINE_CLASS(amovie);
  597.  
  598. AVFilter ff_avsrc_amovie = {
  599.     .name          = "amovie",
  600.     .description   = NULL_IF_CONFIG_SMALL("Read audio from a movie source."),
  601.     .priv_size     = sizeof(MovieContext),
  602.     .init          = movie_common_init,
  603.     .uninit        = movie_uninit,
  604.     .query_formats = movie_query_formats,
  605.  
  606.     .inputs     = NULL,
  607.     .outputs    = NULL,
  608.     .priv_class = &amovie_class,
  609.     .flags      = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
  610. };
  611.  
  612. #endif /* CONFIG_AMOVIE_FILTER */
  613.