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h264_mp4toannexb_bsf: factor out extradata parsing

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This commit is contained in:
Luca Barbato 2013-06-11 16:44:04 +02:00
parent 5d21ca4559
commit 8d929afd25
1 changed files with 78 additions and 68 deletions
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146
libavcodec/h264_mp4toannexb_bsf.c
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@ -58,6 +58,79 @@ static int alloc_and_copy(uint8_t **poutbuf, int *poutbuf_size,
return 0;
}
static int h264_extradata_to_annexb(AVCodecContext *avctx, const int padding)
{
uint16_t unit_size;
uint64_t total_size = 0;
uint8_t *out = NULL, unit_nb, sps_done = 0,
sps_seen = 0, pps_seen = 0;
const uint8_t *extradata = avctx->extradata + 4;
static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
int length_size = (*extradata++ & 0x3) + 1; // retrieve length coded size
if (length_size == 3)
return AVERROR(EINVAL);
/* retrieve sps and pps unit(s) */
unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
if (!unit_nb) {
unit_nb = *extradata++; /* number of pps unit(s) */
sps_done++;
if (unit_nb)
pps_seen = 1;
} else {
sps_seen = 1;
}
while (unit_nb--) {
void *tmp;
unit_size = AV_RB16(extradata);
total_size += unit_size + 4;
if (total_size > INT_MAX - padding ||
extradata + 2 + unit_size > avctx->extradata +
avctx->extradata_size) {
av_free(out);
return AVERROR(EINVAL);
}
tmp = av_realloc(out, total_size + padding);
if (!tmp) {
av_free(out);
return AVERROR(ENOMEM);
}
out = tmp;
memcpy(out + total_size - unit_size - 4, nalu_header, 4);
memcpy(out + total_size - unit_size, extradata + 2, unit_size);
extradata += 2 + unit_size;
if (!unit_nb && !sps_done++) {
unit_nb = *extradata++; /* number of pps unit(s) */
if (unit_nb)
pps_seen = 1;
}
}
if (out)
memset(out + total_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
if (!sps_seen)
av_log(avctx, AV_LOG_WARNING,
"Warning: SPS NALU missing or invalid. "
"The resulting stream may not play.\n");
if (!pps_seen)
av_log(avctx, AV_LOG_WARNING,
"Warning: PPS NALU missing or invalid. "
"The resulting stream may not play.\n");
av_free(avctx->extradata);
avctx->extradata = out;
avctx->extradata_size = total_size;
return length_size;
}
static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
AVCodecContext *avctx, const char *args,
uint8_t **poutbuf, int *poutbuf_size,
@ -69,6 +142,7 @@ static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
int32_t nal_size;
uint32_t cumul_size = 0;
const uint8_t *buf_end = buf + buf_size;
int ret = 0;
/* nothing to filter */
if (!avctx->extradata || avctx->extradata_size < 6) {
@ -79,74 +153,10 @@ static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
/* retrieve sps and pps NAL units from extradata */
if (!ctx->extradata_parsed) {
uint16_t unit_size;
uint64_t total_size = 0;
uint8_t *out = NULL, unit_nb, sps_done = 0,
sps_seen = 0, pps_seen = 0;
const uint8_t *extradata = avctx->extradata + 4;
static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
/* retrieve length coded size */
ctx->length_size = (*extradata++ & 0x3) + 1;
if (ctx->length_size == 3)
return AVERROR(EINVAL);
/* retrieve sps and pps unit(s) */
unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
if (!unit_nb) {
unit_nb = *extradata++; /* number of pps unit(s) */
sps_done++;
if (unit_nb)
pps_seen = 1;
} else {
sps_seen = 1;
}
while (unit_nb--) {
void *tmp;
unit_size = AV_RB16(extradata);
total_size += unit_size + 4;
if (total_size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE ||
extradata + 2 + unit_size > avctx->extradata +
avctx->extradata_size) {
av_free(out);
return AVERROR(EINVAL);
}
tmp = av_realloc(out, total_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!tmp) {
av_free(out);
return AVERROR(ENOMEM);
}
out = tmp;
memcpy(out + total_size - unit_size - 4, nalu_header, 4);
memcpy(out + total_size - unit_size, extradata + 2, unit_size);
extradata += 2 + unit_size;
if (!unit_nb && !sps_done++) {
unit_nb = *extradata++; /* number of pps unit(s) */
if (unit_nb)
pps_seen = 1;
}
}
if (out)
memset(out + total_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
if (!sps_seen)
av_log(avctx, AV_LOG_WARNING,
"Warning: SPS NALU missing or invalid. "
"The resulting stream may not play.\n");
if (!pps_seen)
av_log(avctx, AV_LOG_WARNING,
"Warning: PPS NALU missing or invalid. "
"The resulting stream may not play.\n");
av_free(avctx->extradata);
avctx->extradata = out;
avctx->extradata_size = total_size;
ret = h264_extradata_to_annexb(avctx, FF_INPUT_BUFFER_PADDING_SIZE);
if (ret < 0)
return ret;
ctx->length_size = ret;
ctx->first_idr = 1;
ctx->extradata_parsed = 1;
}