[FFmpeg-devel] [PATCH 1/5] lavfi: add internal functions for parsing format arguments
Mina Nagy Zaki
mnzaki at gmail.com
Mon Aug 8 17:36:48 CEST 2011
On Mon, Aug 08, 2011 at 11:36:49AM +0200, Stefano Sabatini wrote:
> On date Monday 2011-08-08 11:11:45 +0300, Mina Nagy Zaki encoded:
> > ---
> > libavfilter/formats.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
> > libavfilter/internal.h | 38 +++++++++++++++++++++++++++++++++
> > 2 files changed, 93 insertions(+), 0 deletions(-)
> >
> > diff --git a/libavfilter/formats.c b/libavfilter/formats.c
> > index 214718b..53d24c0 100644
> > --- a/libavfilter/formats.c
> > +++ b/libavfilter/formats.c
> > @@ -19,6 +19,7 @@
> > * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> > */
> >
> > +#include "libavutil/eval.h"
> > #include "libavutil/pixdesc.h"
> > #include "libavutil/audioconvert.h"
> > #include "avfilter.h"
> > @@ -233,3 +234,57 @@ void avfilter_formats_changeref(AVFilterFormats **oldref,
> > }
> > }
> >
> > +/* internal functions for parsing audio format arguments */
> > +
> > +int ff_parse_sample_format(char *arg, void *log_ctx)
> > +{
> > + char *tail;
> > + int sample_fmt = av_get_sample_fmt(arg);
> > + if (sample_fmt == AV_SAMPLE_FMT_NONE) {
> > + sample_fmt = strtol(arg, &tail, 0);
> > + if (*tail || (unsigned)sample_fmt >= AV_SAMPLE_FMT_NB) {
> > + av_log(log_ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n", arg);
> > + return -1;
> > + }
> > + }
> > + return sample_fmt;
> > +}
> > +
> > +int ff_parse_sample_rate(char *arg, void *log_ctx)
> > +{
> > + char *tail;
> > + double sample_rate = av_strtod(arg, &tail);
> > + if (*tail || sample_rate < 1 || (int)sample_rate != sample_rate) {
> > + av_log(log_ctx, AV_LOG_ERROR, "Invalid sample rate '%s'\n", arg);
> > + return -1;
> > + }
> > + return sample_rate;
> > +}
> > +
> > +int64_t ff_parse_channel_layout(char *arg, void *log_ctx)
> > +{
> > + char *tail;
> > + int64_t chlayout = av_get_channel_layout(arg);
> > + if (chlayout <= 0) {
> > + chlayout = strtol(arg, &tail, 0);
> > + if (*tail || chlayout <= 0) {
> > + av_log(log_ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n", arg);
> > + return -1;
> > + }
> > + }
> > + return chlayout;
> > +}
> > +
> > +int ff_parse_packing_format(char *arg, void *log_ctx)
> > +{
> > + char *tail;
> > + int planar = strtol(arg, &tail, 10);
> > + if (*tail) {
> > + planar = (strcmp(arg, "packed") != 0);
> > + } else if (planar != 0 && planar != 1) {
> > + av_log(log_ctx, AV_LOG_ERROR, "Invalid packing format '%s'\n", arg);
> > + return -1;
> > + }
> > + return planar;
> > +}
>
> s/return -1/return AVERROR(EINVAL)/
>
> > +
> > diff --git a/libavfilter/internal.h b/libavfilter/internal.h
> > index 7537565..b0a252c 100644
> > --- a/libavfilter/internal.h
> > +++ b/libavfilter/internal.h
> > @@ -61,4 +61,42 @@ void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
> > /** Tell is a format is contained in the provided list terminated by -1. */
> > int ff_fmt_is_in(int fmt, const int *fmts);
> >
> > +/* Functions to parse audio format arguments */
> > +
> > +/**
> > + * Parse a sample rate.
> > + *
> > + * @param arg string to parse
> > + * @param log_ctx log ctx
>
> > + * @return sample rate or -1 on error
>
> @return sample rate or a negative AVERROR code in case of error
>
> more general, and you can reuse the issued error code
>
> [...]
>
> Looks fine otherwise.
Fixed and updated.
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