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Move MJPEG's input buffer preprocessing in separate public function 

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
anatoly 2011-03-27 22:16:24 +02:00 committed by Michael Niedermayer
parent 34686566f3
commit 7e6a9e6444
2 changed files with 55 additions and 32 deletions
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84
libavcodec/mjpegdec.c
View File

@ -1299,43 +1299,26 @@ found:
return val;
}
int ff_mjpeg_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
int ff_mjpeg_find_marker(MJpegDecodeContext *s,
const uint8_t **buf_ptr, const uint8_t *buf_end,
const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MJpegDecodeContext *s = avctx->priv_data;
const uint8_t *buf_end, *buf_ptr;
int start_code;
AVFrame *picture = data;
start_code = find_marker(buf_ptr, buf_end);
s->got_picture = 0; // picture from previous image can not be reused
buf_ptr = buf;
buf_end = buf + buf_size;
while (buf_ptr < buf_end) {
/* find start next marker */
start_code = find_marker(&buf_ptr, buf_end);
{
/* EOF */
if (start_code < 0) {
goto the_end;
} else {
av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
if ((buf_end - buf_ptr) > s->buffer_size)
if ((buf_end - *buf_ptr) > s->buffer_size)
{
av_free(s->buffer);
s->buffer_size = buf_end-buf_ptr;
s->buffer_size = buf_end - *buf_ptr;
s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
av_log(s->avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
s->buffer_size);
}
/* unescape buffer of SOS, use special treatment for JPEG-LS */
if (start_code == SOS && !s->ls)
{
const uint8_t *src = buf_ptr;
const uint8_t *src = *buf_ptr;
uint8_t *dst = s->buffer;
while (src<buf_end)
@ -1343,7 +1326,7 @@ int ff_mjpeg_decode_frame(AVCodecContext *avctx,
uint8_t x = *(src++);
*(dst++) = x;
if (avctx->codec_id != CODEC_ID_THP)
if (s->avctx->codec_id != CODEC_ID_THP)
{
if (x == 0xff) {
while (src < buf_end && x == 0xff)
@ -1356,13 +1339,14 @@ int ff_mjpeg_decode_frame(AVCodecContext *avctx,
}
}
}
init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
*unescaped_buf_ptr = s->buffer;
*unescaped_buf_size = dst - s->buffer;
av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
(buf_end - buf_ptr) - (dst - s->buffer));
av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
(buf_end - *buf_ptr) - (dst - s->buffer));
}
else if(start_code == SOS && s->ls){
const uint8_t *src = buf_ptr;
const uint8_t *src = *buf_ptr;
uint8_t *dst = s->buffer;
int bit_count = 0;
int t = 0, b = 0;
@ -1398,10 +1382,46 @@ int ff_mjpeg_decode_frame(AVCodecContext *avctx,
}
flush_put_bits(&pb);
init_get_bits(&s->gb, dst, bit_count);
*unescaped_buf_ptr = dst;
*unescaped_buf_size = (bit_count + 7) >> 3;
}
else
init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
{
*unescaped_buf_ptr = *buf_ptr;
*unescaped_buf_size = buf_end - *buf_ptr;
}
return start_code;
}
int ff_mjpeg_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MJpegDecodeContext *s = avctx->priv_data;
const uint8_t *buf_end, *buf_ptr;
const uint8_t *unescaped_buf_ptr;
int unescaped_buf_size;
int start_code;
AVFrame *picture = data;
s->got_picture = 0; // picture from previous image can not be reused
buf_ptr = buf;
buf_end = buf + buf_size;
while (buf_ptr < buf_end) {
/* find start next marker */
start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
&unescaped_buf_ptr, &unescaped_buf_size);
{
/* EOF */
if (start_code < 0) {
goto the_end;
} else {
av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size*8);
s->start_code = start_code;
if(s->avctx->debug & FF_DEBUG_STARTCODE){

3
libavcodec/mjpegdec.h
View File

@ -117,5 +117,8 @@ int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
const uint8_t *mb_bitmask, const AVFrame *reference);
int ff_mjpeg_find_marker(MJpegDecodeContext *s,
const uint8_t **buf_ptr, const uint8_t *buf_end,
const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
#endif /* AVCODEC_MJPEGDEC_H */