int webm_guess_framerate(struct WebmInputContext *webm_ctx, struct VpxInputContext *vpx_ctx) { uint32_t i; uint64_t tstamp = 0; /* Check to see if we can seek before we parse any data. */ if (nestegg_track_seek(webm_ctx->nestegg_ctx, webm_ctx->video_track, 0)) { warn("Failed to guess framerate (no Cues), set to 30fps.\n"); vpx_ctx->framerate.numerator = 30; vpx_ctx->framerate.denominator = 1; return 0; } /* Guess the framerate. Read up to 1 second, or 50 video packets, * whichever comes first. */ for (i = 0; tstamp < 1000000000 && i < 50;) { nestegg_packet *pkt; uint32_t track; if (nestegg_read_packet(webm_ctx->nestegg_ctx, &pkt) <= 0) break; nestegg_packet_track(pkt, &track); if (track == webm_ctx->video_track) { nestegg_packet_tstamp(pkt, &tstamp); ++i; } nestegg_free_packet(pkt); } if (nestegg_track_seek(webm_ctx->nestegg_ctx, webm_ctx->video_track, 0)) goto fail; vpx_ctx->framerate.numerator = (i - 1) * 1000000; vpx_ctx->framerate.denominator = (int)(tstamp / 1000); return 0; fail: nestegg_destroy(webm_ctx->nestegg_ctx); webm_ctx->nestegg_ctx = NULL; rewind(vpx_ctx->file); return 1; }
int main(int argc, char * argv[]) { FILE * fp; int r, type; nestegg * ctx; nestegg_audio_params aparams; nestegg_packet * pkt; nestegg_video_params vparams; size_t length, size; uint64_t duration, tstamp, pkt_tstamp; unsigned char * codec_data, * ptr; unsigned int cnt, i, j, track, tracks, pkt_cnt, pkt_track; unsigned int data_items = 0; nestegg_io io = { stdio_read, stdio_seek, stdio_tell, NULL }; if (argc != 2) return EXIT_FAILURE; fp = fopen(argv[1], "rb"); if (!fp) return EXIT_FAILURE; io.userdata = fp; ctx = NULL; r = nestegg_init(&ctx, io, log_callback, -1); if (r != 0) return EXIT_FAILURE; nestegg_track_count(ctx, &tracks); r = nestegg_duration(ctx, &duration); if (r == 0) { #if defined(DEBUG) fprintf(stderr, "media has %u tracks and duration %fs\n", tracks, duration / 1e9); #endif } else { #if defined(DEBUG) fprintf(stderr, "media has %u tracks and unknown duration, using 10s default\n", tracks); #endif duration = 10000000000; } for (i = 0; i < tracks; ++i) { type = nestegg_track_type(ctx, i); #if defined(DEBUG) fprintf(stderr, "track %u: type: %d codec: %d", i, type, nestegg_track_codec_id(ctx, i)); #endif nestegg_track_codec_data_count(ctx, i, &data_items); for (j = 0; j < data_items; ++j) { nestegg_track_codec_data(ctx, i, j, &codec_data, &length); #if defined(DEBUG) fprintf(stderr, " (%p, %u)", codec_data, (unsigned int) length); #endif } if (type == NESTEGG_TRACK_VIDEO) { nestegg_track_video_params(ctx, i, &vparams); #if defined(DEBUG) fprintf(stderr, " video: %ux%u (d: %ux%u %ux%ux%ux%u)", vparams.width, vparams.height, vparams.display_width, vparams.display_height, vparams.crop_top, vparams.crop_left, vparams.crop_bottom, vparams.crop_right); #endif } else if (type == NESTEGG_TRACK_AUDIO) { nestegg_track_audio_params(ctx, i, &aparams); #if defined(DEBUG) fprintf(stderr, " audio: %.2fhz %u bit %u channels", aparams.rate, aparams.depth, aparams.channels); #endif } #if defined(DEBUG) fprintf(stderr, "\n"); #endif } #if defined(SEEK_TEST) #if defined(DEBUG) fprintf(stderr, "seek to middle\n"); #endif r = nestegg_track_seek(ctx, 0, duration / 2); if (r == 0) { #if defined(DEBUG) fprintf(stderr, "middle "); #endif r = nestegg_read_packet(ctx, &pkt); if (r == 1) { nestegg_packet_track(pkt, &track); nestegg_packet_count(pkt, &cnt); nestegg_packet_tstamp(pkt, &tstamp); #if defined(DEBUG) fprintf(stderr, "* t %u pts %f frames %u\n", track, tstamp / 1e9, cnt); #endif nestegg_free_packet(pkt); } else { #if defined(DEBUG) fprintf(stderr, "middle seek failed\n"); #endif } } #if defined(DEBUG) fprintf(stderr, "seek to ~end\n"); #endif r = nestegg_track_seek(ctx, 0, duration - (duration / 10)); if (r == 0) { #if defined(DEBUG) fprintf(stderr, "end "); #endif r = nestegg_read_packet(ctx, &pkt); if (r == 1) { nestegg_packet_track(pkt, &track); nestegg_packet_count(pkt, &cnt); nestegg_packet_tstamp(pkt, &tstamp); #if defined(DEBUG) fprintf(stderr, "* t %u pts %f frames %u\n", track, tstamp / 1e9, cnt); #endif nestegg_free_packet(pkt); } else { #if defined(DEBUG) fprintf(stderr, "end seek failed\n"); #endif } } #if defined(DEBUG) fprintf(stderr, "seek to ~start\n"); #endif r = nestegg_track_seek(ctx, 0, duration / 10); if (r == 0) { #if defined(DEBUG) fprintf(stderr, "start "); #endif r = nestegg_read_packet(ctx, &pkt); if (r == 1) { nestegg_packet_track(pkt, &track); nestegg_packet_count(pkt, &cnt); nestegg_packet_tstamp(pkt, &tstamp); #if defined(DEBUG) fprintf(stderr, "* t %u pts %f frames %u\n", track, tstamp / 1e9, cnt); #endif nestegg_free_packet(pkt); } else { #if defined(DEBUG) fprintf(stderr, "start seek failed\n"); #endif } } #endif while (nestegg_read_packet(ctx, &pkt) > 0) { nestegg_packet_track(pkt, &pkt_track); nestegg_packet_count(pkt, &pkt_cnt); nestegg_packet_tstamp(pkt, &pkt_tstamp); #if defined(DEBUG) fprintf(stderr, "t %u pts %f frames %u: ", pkt_track, pkt_tstamp / 1e9, pkt_cnt); #endif for (i = 0; i < pkt_cnt; ++i) { nestegg_packet_data(pkt, i, &ptr, &size); #if defined(DEBUG) fprintf(stderr, "%u ", (unsigned int) size); #endif } #if defined(DEBUG) fprintf(stderr, "\n"); #endif nestegg_free_packet(pkt); } nestegg_destroy(ctx); fclose(fp); return EXIT_SUCCESS; }