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doc/examples/filtering_audio: add more error checks
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parent
82e74ee6e4
commit
55c57658d2
@ -85,7 +85,7 @@ static int open_input_file(const char *filename)
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static int init_filters(const char *filters_descr)
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{
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char args[512];
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int ret;
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int ret = 0;
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AVFilter *abuffersrc = avfilter_get_by_name("abuffer");
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AVFilter *abuffersink = avfilter_get_by_name("abuffersink");
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AVFilterInOut *outputs = avfilter_inout_alloc();
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@ -97,6 +97,10 @@ static int init_filters(const char *filters_descr)
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AVRational time_base = fmt_ctx->streams[audio_stream_index]->time_base;
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filter_graph = avfilter_graph_alloc();
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if (!outputs || !inputs || !filter_graph) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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/* buffer audio source: the decoded frames from the decoder will be inserted here. */
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if (!dec_ctx->channel_layout)
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@ -109,7 +113,7 @@ static int init_filters(const char *filters_descr)
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args, NULL, filter_graph);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n");
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return ret;
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goto end;
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}
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/* buffer audio sink: to terminate the filter chain. */
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@ -117,28 +121,28 @@ static int init_filters(const char *filters_descr)
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NULL, NULL, filter_graph);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n");
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return ret;
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goto end;
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}
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ret = av_opt_set_int_list(buffersink_ctx, "sample_fmts", out_sample_fmts, -1,
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AV_OPT_SEARCH_CHILDREN);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n");
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return ret;
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goto end;
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}
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ret = av_opt_set_int_list(buffersink_ctx, "channel_layouts", out_channel_layouts, -1,
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AV_OPT_SEARCH_CHILDREN);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n");
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return ret;
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goto end;
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}
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ret = av_opt_set_int_list(buffersink_ctx, "sample_rates", out_sample_rates, -1,
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AV_OPT_SEARCH_CHILDREN);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n");
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return ret;
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goto end;
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}
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/* Endpoints for the filter graph. */
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@ -153,11 +157,11 @@ static int init_filters(const char *filters_descr)
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inputs->next = NULL;
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if ((ret = avfilter_graph_parse_ptr(filter_graph, filters_descr,
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&inputs, &outputs, NULL)) < 0)
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return ret;
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&inputs, &outputs, NULL)) < 0)
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goto end;
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if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
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return ret;
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goto end;
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/* Print summary of the sink buffer
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* Note: args buffer is reused to store channel layout string */
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@ -168,7 +172,11 @@ static int init_filters(const char *filters_descr)
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(char *)av_x_if_null(av_get_sample_fmt_name(outlink->format), "?"),
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args);
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return 0;
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end:
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avfilter_inout_free(&inputs);
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avfilter_inout_free(&outputs);
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return ret;
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}
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static void print_frame(const AVFrame *frame)
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