diff options
author | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2011-08-18 14:26:15 +0200 |
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committer | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2011-08-27 12:46:55 +0200 |
commit | 24ddfb2bdb8a02971c3932901bc87f233b23a12f (patch) | |
tree | e065e773dad55eba7be332cd56c4b7de968923ce /libavfilter/src_movie.c | |
parent | 1d6eca2d27a7e106a3acd01c89e7de58400c4c61 (diff) |
lavfi: add amovie source - audio movie source
Diffstat (limited to 'libavfilter/src_movie.c')
-rw-r--r-- | libavfilter/src_movie.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/libavfilter/src_movie.c b/libavfilter/src_movie.c index f8001f849c..0f683db0b2 100644 --- a/libavfilter/src_movie.c +++ b/libavfilter/src_movie.c @@ -55,6 +55,13 @@ typedef struct { /* video-only fields */ int w, h; AVFilterBufferRef *picref; + + /* audio-only fields */ + void *samples_buf; + int samples_buf_size; + int bps; ///< bytes per sample + AVPacket pkt, pkt0; + AVFilterBufferRef *samplesref; } MovieContext; #define OFFSET(x) offsetof(MovieContext, x) @@ -185,8 +192,13 @@ static av_cold void movie_common_uninit(AVFilterContext *ctx) avfilter_unref_buffer(movie->picref); av_freep(&movie->frame); + + avfilter_unref_buffer(movie->samplesref); + av_freep(&movie->samples_buf); } +#if CONFIG_MOVIE_FILTER + static av_cold int movie_init(AVFilterContext *ctx, const char *args, void *opaque) { MovieContext *movie = ctx->priv; @@ -317,3 +329,148 @@ AVFilter avfilter_vsrc_movie = { .config_props = movie_config_output_props, }, { .name = NULL}}, }; + +#endif /* CONFIG_MOVIE_FILTER */ + +#if CONFIG_AMOVIE_FILTER + +static av_cold int amovie_init(AVFilterContext *ctx, const char *args, void *opaque) +{ + MovieContext *movie = ctx->priv; + int ret; + + if ((ret = movie_common_init(ctx, args, opaque, AVMEDIA_TYPE_AUDIO)) < 0) + return ret; + + movie->bps = av_get_bytes_per_sample(movie->codec_ctx->sample_fmt); + return 0; +} + +static int amovie_query_formats(AVFilterContext *ctx) +{ + MovieContext *movie = ctx->priv; + AVCodecContext *c = movie->codec_ctx; + + enum AVSampleFormat sample_fmts[] = { c->sample_fmt, -1 }; + int packing_fmts[] = { AVFILTER_PACKED, -1 }; + int64_t chlayouts[] = { c->channel_layout, -1 }; + + avfilter_set_common_sample_formats (ctx, avfilter_make_format_list(sample_fmts)); + avfilter_set_common_packing_formats(ctx, avfilter_make_format_list(packing_fmts)); + avfilter_set_common_channel_layouts(ctx, avfilter_make_format64_list(chlayouts)); + + return 0; +} + +static int amovie_config_output_props(AVFilterLink *outlink) +{ + MovieContext *movie = outlink->src->priv; + AVCodecContext *c = movie->codec_ctx; + + outlink->sample_rate = c->sample_rate; + outlink->time_base = movie->format_ctx->streams[movie->stream_index]->time_base; + + return 0; +} + +static int amovie_get_samples(AVFilterLink *outlink) +{ + MovieContext *movie = outlink->src->priv; + AVPacket pkt; + int ret, samples_size, decoded_data_size; + + if (!movie->pkt.size && movie->is_done == 1) + return AVERROR_EOF; + + /* check for another frame, in case the previous one was completely consumed */ + if (!movie->pkt.size) { + while ((ret = av_read_frame(movie->format_ctx, &pkt)) >= 0) { + // Is this a packet from the selected stream? + if (pkt.stream_index != movie->stream_index) { + av_free_packet(&pkt); + continue; + } else { + movie->pkt0 = movie->pkt = pkt; + break; + } + } + + if (ret == AVERROR_EOF) { + movie->is_done = 1; + return ret; + } + } + + /* reallocate the buffer for the decoded samples, if necessary */ + samples_size = + FFMAX(movie->pkt.size*sizeof(movie->bps), AVCODEC_MAX_AUDIO_FRAME_SIZE); + if (samples_size > movie->samples_buf_size) { + movie->samples_buf = av_fast_realloc(movie->samples_buf, + &movie->samples_buf_size, samples_size); + if (!movie->samples_buf) + return AVERROR(ENOMEM); + } + decoded_data_size = movie->samples_buf_size; + + /* decode and update the movie pkt */ + ret = avcodec_decode_audio3(movie->codec_ctx, movie->samples_buf, + &decoded_data_size, &movie->pkt); + if (ret < 0) + return ret; + movie->pkt.data += ret; + movie->pkt.size -= ret; + + /* wrap the decoded data in a samplesref */ + if (decoded_data_size > 0) { + int nb_samples = decoded_data_size / movie->bps / movie->codec_ctx->channels; + movie->samplesref = + avfilter_get_audio_buffer(outlink, AV_PERM_WRITE, + movie->codec_ctx->sample_fmt, nb_samples, + movie->codec_ctx->channel_layout, 0); + memcpy(movie->samplesref->data[0], movie->samples_buf, decoded_data_size); + movie->samplesref->pts = movie->pkt.pts; + movie->samplesref->pos = movie->pkt.pos; + movie->samplesref->audio->sample_rate = movie->codec_ctx->sample_rate; + } + + // We got it. Free the packet since we are returning + if (movie->pkt.size <= 0) + av_free_packet(&movie->pkt0); + + return 0; +} + +static int amovie_request_frame(AVFilterLink *outlink) +{ + MovieContext *movie = outlink->src->priv; + int ret; + + if (movie->is_done) + return AVERROR_EOF; + if ((ret = amovie_get_samples(outlink)) < 0) + return ret; + + avfilter_filter_samples(outlink, avfilter_ref_buffer(movie->samplesref, ~0)); + avfilter_unref_buffer(movie->samplesref); + movie->samplesref = NULL; + + return 0; +} + +AVFilter avfilter_asrc_amovie = { + .name = "amovie", + .description = NULL_IF_CONFIG_SMALL("Read audio from a movie source."), + .priv_size = sizeof(MovieContext), + .init = amovie_init, + .uninit = movie_common_uninit, + .query_formats = amovie_query_formats, + + .inputs = (AVFilterPad[]) {{ .name = NULL }}, + .outputs = (AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .request_frame = amovie_request_frame, + .config_props = amovie_config_output_props, }, + { .name = NULL}}, +}; + +#endif /* CONFIG_AMOVIE_FILTER */ |