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libavformat: Add a utility function for adding parameter change side data 

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2011-12-16 12:48:09 +02:00
parent fe75dc8583
commit 3e79c2adb1
2 changed files with 51 additions and 0 deletions
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8
libavformat/internal.h
View File

@ -299,4 +299,12 @@ int64_t ff_gen_search(AVFormatContext *s, int stream_index,
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
unsigned int pts_num, unsigned int pts_den);
/**
* Add side data to a packet for changing parameters to the given values.
* Parameters set to 0 aren't included in the change.
*/
int ff_add_param_change(AVPacket *pkt, int32_t channels,
uint64_t channel_layout, int32_t sample_rate,
int32_t width, int32_t height);
#endif /* AVFORMAT_INTERNAL_H */

43
libavformat/utils.c
View File

@ -25,6 +25,7 @@
#include "avio_internal.h"
#include "internal.h"
#include "libavcodec/internal.h"
#include "libavcodec/bytestream.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/pixdesc.h"
@ -4017,3 +4018,45 @@ int avformat_network_deinit(void)
#endif
return 0;
}
int ff_add_param_change(AVPacket *pkt, int32_t channels,
uint64_t channel_layout, int32_t sample_rate,
int32_t width, int32_t height)
{
uint32_t flags = 0;
int size = 4;
uint8_t *data;
if (!pkt)
return AVERROR(EINVAL);
if (channels) {
size += 4;
flags |= AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT;
}
if (channel_layout) {
size += 8;
flags |= AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT;
}
if (sample_rate) {
size += 4;
flags |= AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE;
}
if (width || height) {
size += 8;
flags |= AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS;
}
data = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, size);
if (!data)
return AVERROR(ENOMEM);
bytestream_put_le32(&data, flags);
if (channels)
bytestream_put_le32(&data, channels);
if (channel_layout)
bytestream_put_le64(&data, channel_layout);
if (sample_rate)
bytestream_put_le32(&data, sample_rate);
if (width || height) {
bytestream_put_le32(&data, width);
bytestream_put_le32(&data, height);
}
return 0;
}