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doc/examples/filtering_audio: add more error checks

This commit is contained in:
Stefano Sabatini 2013-12-02 13:18:11 +01:00
parent 82e74ee6e4
commit 55c57658d2
1 changed files with 18 additions and 10 deletions
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28
doc/examples/filtering_audio.c
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@ -85,7 +85,7 @@ static int open_input_file(const char *filename)
static int init_filters(const char *filters_descr)
{
char args[512];
int ret;
int ret = 0;
AVFilter *abuffersrc = avfilter_get_by_name("abuffer");
AVFilter *abuffersink = avfilter_get_by_name("abuffersink");
AVFilterInOut *outputs = avfilter_inout_alloc();
@ -97,6 +97,10 @@ static int init_filters(const char *filters_descr)
AVRational time_base = fmt_ctx->streams[audio_stream_index]->time_base;
filter_graph = avfilter_graph_alloc();
if (!outputs || !inputs || !filter_graph) {
ret = AVERROR(ENOMEM);
goto end;
}
/* buffer audio source: the decoded frames from the decoder will be inserted here. */
if (!dec_ctx->channel_layout)
@ -109,7 +113,7 @@ static int init_filters(const char *filters_descr)
args, NULL, filter_graph);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n");
return ret;
goto end;
}
/* buffer audio sink: to terminate the filter chain. */
@ -117,28 +121,28 @@ static int init_filters(const char *filters_descr)
NULL, NULL, filter_graph);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n");
return ret;
goto end;
}
ret = av_opt_set_int_list(buffersink_ctx, "sample_fmts", out_sample_fmts, -1,
AV_OPT_SEARCH_CHILDREN);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n");
return ret;
goto end;
}
ret = av_opt_set_int_list(buffersink_ctx, "channel_layouts", out_channel_layouts, -1,
AV_OPT_SEARCH_CHILDREN);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n");
return ret;
goto end;
}
ret = av_opt_set_int_list(buffersink_ctx, "sample_rates", out_sample_rates, -1,
AV_OPT_SEARCH_CHILDREN);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n");
return ret;
goto end;
}
/* Endpoints for the filter graph. */
@ -153,11 +157,11 @@ static int init_filters(const char *filters_descr)
inputs->next = NULL;
if ((ret = avfilter_graph_parse_ptr(filter_graph, filters_descr,
&inputs, &outputs, NULL)) < 0)
return ret;
&inputs, &outputs, NULL)) < 0)
goto end;
if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
return ret;
goto end;
/* Print summary of the sink buffer
* Note: args buffer is reused to store channel layout string */
@ -168,7 +172,11 @@ static int init_filters(const char *filters_descr)
(char *)av_x_if_null(av_get_sample_fmt_name(outlink->format), "?"),
args);
return 0;
end:
avfilter_inout_free(&inputs);
avfilter_inout_free(&outputs);
return ret;
}
static void print_frame(const AVFrame *frame)