---
libavformat/internal.h | 8 ++++++++
libavformat/utils.c | 43 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/libavformat/internal.h b/libavformat/internal.h
index 4573668..0dc84ab 100644
--- a/libavformat/internal.h
+++ b/libavformat/internal.h
@@ -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, uint32_t channels,
+ uint64_t channel_layout, uint32_t sample_rate,
+ uint32_t width, uint32_t height);
+
#endif /* AVFORMAT_INTERNAL_H */
diff --git a/libavformat/utils.c b/libavformat/utils.c
index f424285..af11428 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -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"
@@ -4012,3 +4013,45 @@ int avformat_network_deinit(void)
#endif
return 0;
}
+
+int ff_add_param_change(AVPacket *pkt, uint32_t channels,
+ uint64_t channel_layout, uint32_t sample_rate,
+ uint32_t width, uint32_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;
+}
--
1.7.3.1
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