static int maybe_init_filter_graph(struct GroovePlaylist *playlist, struct GrooveFile *file) { struct GroovePlaylistPrivate *p = (struct GroovePlaylistPrivate *) playlist; struct GrooveFilePrivate *f = (struct GrooveFilePrivate *) file; AVCodecContext *avctx = f->audio_st->codec; AVRational time_base = f->audio_st->time_base; // if the input format stuff has changed, then we need to re-build the graph if (!p->filter_graph || p->rebuild_filter_graph_flag || p->in_sample_rate != avctx->sample_rate || p->in_channel_layout != avctx->channel_layout || p->in_sample_fmt != avctx->sample_fmt || p->in_time_base.num != time_base.num || p->in_time_base.den != time_base.den || p->volume != p->filter_volume) { return init_filter_graph(playlist, file); } return 0; }
int main(int argc, char *argv[]) { struct AVMD5 *md5; AVFilterGraph *graph; AVFilterContext *src, *sink; AVFrame *frame; uint8_t errstr[1024]; float duration; int err, nb_frames, i; if (argc < 2) { fprintf(stderr, "Usage: %s <duration>\n", argv[0]); return 1; } duration = atof(argv[1]); nb_frames = duration * INPUT_SAMPLERATE / FRAME_SIZE; if (nb_frames <= 0) { fprintf(stderr, "Invalid duration: %s\n", argv[1]); return 1; } avfilter_register_all(); /* Allocate the frame we will be using to store the data. */ frame = av_frame_alloc(); if (!frame) { fprintf(stderr, "Error allocating the frame\n"); return 1; } md5 = av_md5_alloc(); if (!md5) { fprintf(stderr, "Error allocating the MD5 context\n"); return 1; } /* Set up the filtergraph. */ err = init_filter_graph(&graph, &src, &sink); if (err < 0) { fprintf(stderr, "Unable to init filter graph:"); goto fail; } /* the main filtering loop */ for (i = 0; i < nb_frames; i++) { /* get an input frame to be filtered */ err = get_input(frame, i); if (err < 0) { fprintf(stderr, "Error generating input frame:"); goto fail; } /* Send the frame to the input of the filtergraph. */ err = av_buffersrc_add_frame(src, frame); if (err < 0) { av_frame_unref(frame); fprintf(stderr, "Error submitting the frame to the filtergraph:"); goto fail; } /* Get all the filtered output that is available. */ while ((err = av_buffersink_get_frame(sink, frame)) >= 0) { /* now do something with our filtered frame */ err = process_output(md5, frame); if (err < 0) { fprintf(stderr, "Error processing the filtered frame:"); goto fail; } av_frame_unref(frame); } if (err == AVERROR(EAGAIN)) { /* Need to feed more frames in. */ continue; } else if (err == AVERROR_EOF) { /* Nothing more to do, finish. */ break; } else if (err < 0) { /* An error occurred. */ fprintf(stderr, "Error filtering the data:"); goto fail; } } avfilter_graph_free(&graph); av_frame_free(&frame); av_freep(&md5); return 0; fail: av_strerror(err, errstr, sizeof(errstr)); fprintf(stderr, "%s\n", errstr); return 1; }