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avcodec/packet: add generic side data helpers

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Handling AVPacketSideData directly, which can used on structs other than
AVPacket.
This will be useful in the following commits.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2023-07-16 15:03:49 -03:00
parent f62c441e7a
commit 74279227dd
4 changed files with 198 additions and 5 deletions
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100
libavcodec/avpacket.c
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@@ -646,3 +646,103 @@ int ff_side_data_set_prft(AVPacket *pkt, int64_t timestamp)
return 0;
}
const AVPacketSideData *av_packet_side_data_get(const AVPacketSideData *sd, int nb_sd,
enum AVPacketSideDataType type)
{
for (int i = 0; i < nb_sd; i++)
if (sd[i].type == type)
return &sd[i];
return NULL;
}
static AVPacketSideData *packet_side_data_add(AVPacketSideData **psd, int *pnb_sd,
enum AVPacketSideDataType type,
void *data, size_t size)
{
AVPacketSideData *sd = *psd, *tmp;
int nb_sd = *pnb_sd;
for (int i = 0; i < nb_sd; i++) {
if (sd[i].type != type)
continue;
av_free(sd[i].data);
sd[i].data = data;
sd[i].size = size;
return &sd[i];
}
if (nb_sd == INT_MAX)
return NULL;
tmp = av_realloc_array(sd, nb_sd + 1, sizeof(*tmp));
if (!tmp)
return NULL;
*psd = sd = tmp;
sd[nb_sd].type = type;
sd[nb_sd].data = data;
sd[nb_sd].size = size;
*pnb_sd = nb_sd + 1;
return &sd[nb_sd];
}
AVPacketSideData *av_packet_side_data_add(AVPacketSideData **psd, int *pnb_sd,
enum AVPacketSideDataType type,
void *data, size_t size, int flags)
{
return packet_side_data_add(psd, pnb_sd, type, data, size);
}
AVPacketSideData *av_packet_side_data_new(AVPacketSideData **psd, int *pnb_sd,
enum AVPacketSideDataType type,
size_t size, int flags)
{
AVPacketSideData *sd = NULL;
uint8_t *data;
if (size > SIZE_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
return NULL;
data = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!data)
return NULL;
memset(data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
sd = packet_side_data_add(psd, pnb_sd, type, data, size);
if (!sd)
av_freep(&data);
return sd;
}
void av_packet_side_data_remove(AVPacketSideData *sd, int *pnb_sd,
enum AVPacketSideDataType type)
{
int nb_sd = *pnb_sd;
for (int i = nb_sd - 1; i >= 0; i--) {
if (sd[i].type != type)
continue;
av_free(sd[i].data);
sd[i] = sd[--nb_sd];
break;
}
*pnb_sd = nb_sd;
}
void av_packet_side_data_free(AVPacketSideData **psd, int *pnb_sd)
{
AVPacketSideData *sd = *psd;
int nb_sd = *pnb_sd;
for (int i = 0; i < nb_sd; i++)
av_free(sd[i].data);
av_freep(psd);
*pnb_sd = 0;
}