[SCM] libav/experimental: set pict_type in VC-1 parser, fix some timestamps problems
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 16:46:44 UTC 2013
The following commit has been merged in the experimental branch:
commit 2d05bc86418681905f85ff7c621457756397a2ae
Author: Baptiste Coudurier <baptiste.coudurier at gmail.com>
Date: Sat May 30 00:09:00 2009 +0000
set pict_type in VC-1 parser, fix some timestamps problems
Originally committed as revision 18987 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index 82bf8db..8d79c18 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -805,10 +805,8 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb);
* @param gb GetBit context initialized from Codec context extra_data
* @return Status
*/
-static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)
+int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
{
- VC1Context *v = avctx->priv_data;
-
av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits(gb, 32));
v->profile = get_bits(gb, 2);
if (v->profile == PROFILE_COMPLEX)
@@ -1025,9 +1023,8 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
return 0;
}
-static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)
+int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
{
- VC1Context *v = avctx->priv_data;
int i;
av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));
@@ -1074,7 +1071,7 @@ static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)
return 0;
}
-static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
+int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
{
int pqindex, lowquant, status;
@@ -1101,6 +1098,9 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)
skip_bits(gb, 7); // skip buffer fullness
+ if(v->parse_only)
+ return 0;
+
/* calculate RND */
if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_BI_TYPE)
v->rnd = 1;
@@ -1286,7 +1286,7 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
return 0;
}
-static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
+int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
{
int pqindex, lowquant;
int status;
@@ -1362,6 +1362,9 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
if(v->s.pict_type == FF_I_TYPE || v->s.pict_type == FF_P_TYPE) v->use_ic = 0;
+ if(v->parse_only)
+ return 0;
+
switch(v->s.pict_type) {
case FF_I_TYPE:
case FF_BI_TYPE:
@@ -3915,41 +3918,6 @@ static void vc1_decode_blocks(VC1Context *v)
}
}
-/** Find VC-1 marker in buffer
- * @return position where next marker starts or end of buffer if no marker found
- */
-static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
-{
- uint32_t mrk = 0xFFFFFFFF;
-
- if(end-src < 4) return end;
- while(src < end){
- mrk = (mrk << 8) | *src++;
- if(IS_MARKER(mrk))
- return src-4;
- }
- return end;
-}
-
-static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
-{
- int dsize = 0, i;
-
- if(size < 4){
- for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;
- return size;
- }
- for(i = 0; i < size; i++, src++) {
- if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
- dst[dsize++] = src[1];
- src++;
- i++;
- } else
- dst[dsize++] = *src;
- }
- return dsize;
-}
-
/** Initialize a VC1/WMV3 decoder
* @todo TODO: Handle VC-1 IDUs (Transport level?)
* @todo TODO: Decypher remaining bits in extra_data
@@ -3991,7 +3959,7 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);
- if (decode_sequence_header(avctx, &gb) < 0)
+ if (vc1_decode_sequence_header(avctx, v, &gb) < 0)
return -1;
count = avctx->extradata_size*8 - get_bits_count(&gb);
@@ -4028,14 +3996,14 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
init_get_bits(&gb, buf2, buf2_size * 8);
switch(AV_RB32(start)){
case VC1_CODE_SEQHDR:
- if(decode_sequence_header(avctx, &gb) < 0){
+ if(vc1_decode_sequence_header(avctx, v, &gb) < 0){
av_free(buf2);
return -1;
}
seq_initialized = 1;
break;
case VC1_CODE_ENTRYPOINT:
- if(decode_entry_point(avctx, &gb) < 0){
+ if(vc1_decode_entry_point(avctx, v, &gb) < 0){
av_free(buf2);
return -1;
}
@@ -4150,7 +4118,7 @@ static int vc1_decode_frame(AVCodecContext *avctx,
case VC1_CODE_ENTRYPOINT: /* it should be before frame data */
buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);
init_get_bits(&s->gb, buf2, buf_size2*8);
- decode_entry_point(avctx, &s->gb);
+ vc1_decode_entry_point(avctx, v, &s->gb);
break;
case VC1_CODE_SLICE:
av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");
diff --git a/libavcodec/vc1.h b/libavcodec/vc1.h
index 67cdc7a..e90feb2 100644
--- a/libavcodec/vc1.h
+++ b/libavcodec/vc1.h
@@ -310,6 +310,57 @@ typedef struct VC1Context{
uint8_t bfraction_lut_index;///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element)
uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
+
+ int parse_only; ///< Context is used within parser
} VC1Context;
+/** Find VC-1 marker in buffer
+ * @return position where next marker starts or end of buffer if no marker found
+ */
+static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
+{
+ uint32_t mrk = 0xFFFFFFFF;
+
+ if(end-src < 4) return end;
+ while(src < end){
+ mrk = (mrk << 8) | *src++;
+ if(IS_MARKER(mrk))
+ return src-4;
+ }
+ return end;
+}
+
+static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
+{
+ int dsize = 0, i;
+
+ if(size < 4){
+ for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;
+ return size;
+ }
+ for(i = 0; i < size; i++, src++) {
+ if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
+ dst[dsize++] = src[1];
+ src++;
+ i++;
+ } else
+ dst[dsize++] = *src;
+ }
+ return dsize;
+}
+
+/**
+ * Decode Simple/Main Profiles sequence header
+ * @see Figure 7-8, p16-17
+ * @param avctx Codec context
+ * @param gb GetBit context initialized from Codec context extra_data
+ * @return Status
+ */
+int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
+
+int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
+
+int vc1_parse_frame_header (VC1Context *v, GetBitContext *gb);
+int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
+
#endif /* AVCODEC_VC1_H */
diff --git a/libavcodec/vc1_parser.c b/libavcodec/vc1_parser.c
index 3f4618d..55580c9 100644
--- a/libavcodec/vc1_parser.c
+++ b/libavcodec/vc1_parser.c
@@ -27,6 +27,58 @@
#include "parser.h"
#include "vc1.h"
+#include "get_bits.h"
+
+typedef struct {
+ ParseContext pc;
+ VC1Context v;
+} VC1ParseContext;
+
+static void vc1_extract_headers(AVCodecParserContext *s, AVCodecContext *avctx,
+ const uint8_t *buf, int buf_size)
+{
+ VC1ParseContext *vpc = s->priv_data;
+ GetBitContext gb;
+ const uint8_t *start, *end, *next;
+ uint8_t *buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+
+ vpc->v.s.avctx = avctx;
+ vpc->v.parse_only = 1;
+ next = buf;
+
+ for(start = buf, end = buf + buf_size; next < end; start = next){
+ int buf2_size, size;
+
+ next = find_next_marker(start + 4, end);
+ size = next - start - 4;
+ buf2_size = vc1_unescape_buffer(start + 4, size, buf2);
+ init_get_bits(&gb, buf2, buf2_size * 8);
+ if(size <= 0) continue;
+ switch(AV_RB32(start)){
+ case VC1_CODE_SEQHDR:
+ vc1_decode_sequence_header(avctx, &vpc->v, &gb);
+ break;
+ case VC1_CODE_ENTRYPOINT:
+ vc1_decode_entry_point(avctx, &vpc->v, &gb);
+ break;
+ case VC1_CODE_FRAME:
+ if(vpc->v.profile < PROFILE_ADVANCED)
+ vc1_parse_frame_header (&vpc->v, &gb);
+ else
+ vc1_parse_frame_header_adv(&vpc->v, &gb);
+
+ /* keep FF_BI_TYPE internal to VC1 */
+ if (vpc->v.s.pict_type == FF_BI_TYPE)
+ s->pict_type = FF_B_TYPE;
+ else
+ s->pict_type = vpc->v.s.pict_type;
+
+ break;
+ }
+ }
+
+ av_free(buf2);
+}
/**
* finds the end of the current frame in the bitstream.
@@ -75,20 +127,23 @@ static int vc1_parse(AVCodecParserContext *s,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
- ParseContext *pc = s->priv_data;
+ VC1ParseContext *vpc = s->priv_data;
int next;
if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
next= buf_size;
}else{
- next= vc1_find_frame_end(pc, buf, buf_size);
+ next= vc1_find_frame_end(&vpc->pc, buf, buf_size);
- if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+ if (ff_combine_frame(&vpc->pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
}
+
+ vc1_extract_headers(s, avctx, buf, buf_size);
+
*poutbuf = buf;
*poutbuf_size = buf_size;
return next;
@@ -116,7 +171,7 @@ static int vc1_split(AVCodecContext *avctx,
AVCodecParser vc1_parser = {
{ CODEC_ID_VC1 },
- sizeof(ParseContext1),
+ sizeof(VC1ParseContext),
NULL,
vc1_parse,
ff_parse1_close,
--
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