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fftools/ffmpeg_filter: Avoid allocations when configuring output filters

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Use an AVBPrint to handle the (typically short) strings involved here.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2021-04-06 05:26:31 +02:00
parent 059fc2d9da
commit 80399c7910
1 changed files with 41 additions and 58 deletions
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99
fftools/ffmpeg_filter.c
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@@ -127,45 +127,39 @@ static char *choose_pix_fmts(OutputFilter *ofilter)
return NULL; return NULL;
} }
/* Define a function for building a string containing a list of /* Define a function for appending a list of allowed formats
* allowed formats. */ * to an AVBPrint. If nonempty, the list will have a header. */
#define DEF_CHOOSE_FORMAT(suffix, type, var, supported_list, none, get_name) \ #define DEF_CHOOSE_FORMAT(name, type, var, supported_list, none, printf_format, get_name) \
static char *choose_ ## suffix (OutputFilter *ofilter) \ static void choose_ ## name (OutputFilter *ofilter, AVBPrint *bprint) \
{ \ { \
if (ofilter->var == none && !ofilter->supported_list) \
return; \
av_bprintf(bprint, #name "="); \
if (ofilter->var != none) { \ if (ofilter->var != none) { \
get_name(ofilter->var); \ av_bprintf(bprint, printf_format, get_name(ofilter->var)); \
return av_strdup(name); \ } else { \
} else if (ofilter->supported_list) { \
const type *p; \ const type *p; \
AVIOContext *s = NULL; \
uint8_t *ret; \
int len; \
\
if (avio_open_dyn_buf(&s) < 0) \
exit_program(1); \
\ \
for (p = ofilter->supported_list; *p != none; p++) { \ for (p = ofilter->supported_list; *p != none; p++) { \
get_name(*p); \ av_bprintf(bprint, printf_format "|", get_name(*p)); \
avio_printf(s, "%s|", name); \
} \ } \
len = avio_close_dyn_buf(s, &ret); \ if (bprint->len > 0) \
ret[len - 1] = 0; \ bprint->str[--bprint->len] = '\0'; \
return ret; \ } \
} else \ av_bprint_chars(bprint, ':', 1); \
return NULL; \
} }
//DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE, //DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
// GET_PIX_FMT_NAME) // GET_PIX_FMT_NAME)
DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats, DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME) AV_SAMPLE_FMT_NONE, "%s", av_get_sample_fmt_name)
DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0, DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
GET_SAMPLE_RATE_NAME) "%d", )
DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0, DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0,
GET_CH_LAYOUT_NAME) "0x%"PRIx64, )
int init_simple_filtergraph(InputStream *ist, OutputStream *ost) int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
{ {
@@ -525,7 +519,7 @@ static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter,
AVCodecContext *codec = ost->enc_ctx; AVCodecContext *codec = ost->enc_ctx;
AVFilterContext *last_filter = out->filter_ctx; AVFilterContext *last_filter = out->filter_ctx;
int pad_idx = out->pad_idx; int pad_idx = out->pad_idx;
char *sample_fmts, *sample_rates, *channel_layouts; AVBPrint args;
char name[255]; char name[255];
int ret; int ret;
@@ -548,65 +542,52 @@ static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter,
avfilter_get_by_name(filter_name), \ avfilter_get_by_name(filter_name), \
filter_name, arg, NULL, fg->graph); \ filter_name, arg, NULL, fg->graph); \
if (ret < 0) \ if (ret < 0) \
return ret; \ goto fail; \
\ \
ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \ ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \
if (ret < 0) \ if (ret < 0) \
return ret; \ goto fail; \
\ \
last_filter = filt_ctx; \ last_filter = filt_ctx; \
pad_idx = 0; \ pad_idx = 0; \
} while (0) } while (0)
av_bprint_init(&args, 0, AV_BPRINT_SIZE_UNLIMITED);
if (ost->audio_channels_mapped) { if (ost->audio_channels_mapped) {
int i; int i;
AVBPrint pan_buf; av_bprintf(&args, "0x%"PRIx64,
av_bprint_init(&pan_buf, 256, 8192);
av_bprintf(&pan_buf, "0x%"PRIx64,
av_get_default_channel_layout(ost->audio_channels_mapped)); av_get_default_channel_layout(ost->audio_channels_mapped));
for (i = 0; i < ost->audio_channels_mapped; i++) for (i = 0; i < ost->audio_channels_mapped; i++)
if (ost->audio_channels_map[i] != -1) if (ost->audio_channels_map[i] != -1)
av_bprintf(&pan_buf, "|c%d=c%d", i, ost->audio_channels_map[i]); av_bprintf(&args, "|c%d=c%d", i, ost->audio_channels_map[i]);
AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str); AUTO_INSERT_FILTER("-map_channel", "pan", args.str);
av_bprint_finalize(&pan_buf, NULL); av_bprint_clear(&args);
} }
if (codec->channels && !codec->channel_layout) if (codec->channels && !codec->channel_layout)
codec->channel_layout = av_get_default_channel_layout(codec->channels); codec->channel_layout = av_get_default_channel_layout(codec->channels);
sample_fmts = choose_sample_fmts(ofilter); choose_sample_fmts(ofilter, &args);
sample_rates = choose_sample_rates(ofilter); choose_sample_rates(ofilter, &args);
channel_layouts = choose_channel_layouts(ofilter); choose_channel_layouts(ofilter, &args);
if (sample_fmts || sample_rates || channel_layouts) { if (!av_bprint_is_complete(&args)) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (args.len) {
AVFilterContext *format; AVFilterContext *format;
char args[256];
args[0] = 0;
if (sample_fmts)
av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
sample_fmts);
if (sample_rates)
av_strlcatf(args, sizeof(args), "sample_rates=%s:",
sample_rates);
if (channel_layouts)
av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
channel_layouts);
av_freep(&sample_fmts);
av_freep(&sample_rates);
av_freep(&channel_layouts);
snprintf(name, sizeof(name), "format_out_%d_%d", snprintf(name, sizeof(name), "format_out_%d_%d",
ost->file_index, ost->index); ost->file_index, ost->index);
ret = avfilter_graph_create_filter(&format, ret = avfilter_graph_create_filter(&format,
avfilter_get_by_name("aformat"), avfilter_get_by_name("aformat"),
name, args, NULL, fg->graph); name, args.str, NULL, fg->graph);
if (ret < 0) if (ret < 0)
return ret; goto fail;
ret = avfilter_link(last_filter, pad_idx, format, 0); ret = avfilter_link(last_filter, pad_idx, format, 0);
if (ret < 0) if (ret < 0)
return ret; goto fail;
last_filter = format; last_filter = format;
pad_idx = 0; pad_idx = 0;
@@ -631,12 +612,14 @@ static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter,
ret = insert_trim(of->start_time, of->recording_time, ret = insert_trim(of->start_time, of->recording_time,
&last_filter, &pad_idx, name); &last_filter, &pad_idx, name);
if (ret < 0) if (ret < 0)
return ret; goto fail;
if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0) if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
return ret; goto fail;
fail:
av_bprint_finalize(&args, NULL);
return 0; return ret;
} }
static int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, static int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter,