/*
* Audio and Video frame extraction
- * Copyright (c) 2003 Fabrice Bellard.
- * Copyright (c) 2003 Michael Niedermayer.
+ * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2003 Michael Niedermayer
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "avcodec.h"
-#include "mpegvideo.h"
-#include "mpegaudio.h"
-AVCodecParser *av_first_parser = NULL;
+#include <string.h>
+
+#include "parser.h"
+#include "libavutil/mem.h"
+
+static AVCodecParser *av_first_parser = NULL;
+
+AVCodecParser* av_parser_next(AVCodecParser *p){
+ if(p) return p->next;
+ else return av_first_parser;
+}
void av_register_codec_parser(AVCodecParser *parser)
{
AVCodecParserContext *s;
AVCodecParser *parser;
int ret;
-
- if(codec_id == CODEC_ID_NONE)
+
+ if(codec_id == AV_CODEC_ID_NONE)
return NULL;
for(parser = av_first_parser; parser != NULL; parser = parser->next) {
if (!s)
return NULL;
s->parser = parser;
- s->priv_data = av_mallocz(parser->priv_data_size);
- if (!s->priv_data) {
- av_free(s);
- return NULL;
+ if (parser->priv_data_size) {
+ s->priv_data = av_mallocz(parser->priv_data_size);
+ if (!s->priv_data) {
+ av_free(s);
+ return NULL;
+ }
}
if (parser->parser_init) {
ret = parser->parser_init(s);
}
}
s->fetch_timestamp=1;
+ s->pict_type = AV_PICTURE_TYPE_I;
+ s->key_frame = -1;
+ s->convergence_duration = 0;
+ s->dts_sync_point = INT_MIN;
+ s->dts_ref_dts_delta = INT_MIN;
+ s->pts_dts_delta = INT_MIN;
return s;
}
-/* NOTE: buf_size == 0 is used to signal EOF so that the last frame
- can be returned if necessary */
-int av_parser_parse(AVCodecParserContext *s,
- AVCodecContext *avctx,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size,
- int64_t pts, int64_t dts)
+void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){
+ int i;
+
+ s->dts= s->pts= AV_NOPTS_VALUE;
+ s->pos= -1;
+ s->offset= 0;
+ for(i = 0; i < AV_PARSER_PTS_NB; i++) {
+ if ( s->cur_offset + off >= s->cur_frame_offset[i]
+ && (s->frame_offset < s->cur_frame_offset[i] ||
+ (!s->frame_offset && !s->next_frame_offset)) // first field/frame
+ //check is disabled because mpeg-ts doesnt send complete PES packets
+ && /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
+ s->dts= s->cur_frame_dts[i];
+ s->pts= s->cur_frame_pts[i];
+ s->pos= s->cur_frame_pos[i];
+ s->offset = s->next_frame_offset - s->cur_frame_offset[i];
+ if(remove)
+ s->cur_frame_offset[i]= INT64_MAX;
+ if(s->cur_offset + off < s->cur_frame_end[i])
+ break;
+ }
+ }
+}
+
+int av_parser_parse2(AVCodecParserContext *s,
+ AVCodecContext *avctx,
+ uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size,
+ int64_t pts, int64_t dts,
+ int64_t pos)
{
- int index, i, k;
+ int index, i;
uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
-
+
+ if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
+ s->next_frame_offset =
+ s->cur_offset = pos;
+ s->flags |= PARSER_FLAG_FETCHED_OFFSET;
+ }
+
if (buf_size == 0) {
/* padding is always necessary even if EOF, so we add it here */
memset(dummy_buf, 0, sizeof(dummy_buf));
buf = dummy_buf;
- } else {
+ } else if (s->cur_offset + buf_size !=
+ s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
/* add a new packet descriptor */
- k = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
- s->cur_frame_start_index = k;
- s->cur_frame_offset[k] = s->cur_offset;
- s->cur_frame_pts[k] = pts;
- s->cur_frame_dts[k] = dts;
-
- /* fill first PTS/DTS */
- if (s->fetch_timestamp){
- s->fetch_timestamp=0;
- s->last_pts = pts;
- s->last_dts = dts;
- s->cur_frame_pts[k] =
- s->cur_frame_dts[k] = AV_NOPTS_VALUE;
- }
+ i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
+ s->cur_frame_start_index = i;
+ s->cur_frame_offset[i] = s->cur_offset;
+ s->cur_frame_end[i] = s->cur_offset + buf_size;
+ s->cur_frame_pts[i] = pts;
+ s->cur_frame_dts[i] = dts;
+ s->cur_frame_pos[i] = pos;
+ }
+
+ if (s->fetch_timestamp){
+ s->fetch_timestamp=0;
+ s->last_pts = s->pts;
+ s->last_dts = s->dts;
+ s->last_pos = s->pos;
+ ff_fetch_timestamp(s, 0, 0);
}
/* WARNING: the returned index can be negative */
- index = s->parser->parser_parse(s, avctx, poutbuf, poutbuf_size, buf, buf_size);
-//av_log(NULL, AV_LOG_DEBUG, "parser: in:%lld, %lld, out:%lld, %lld, in:%d out:%d id:%d\n", pts, dts, s->last_pts, s->last_dts, buf_size, *poutbuf_size, avctx->codec_id);
+ index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size);
/* update the file pointer */
if (*poutbuf_size) {
/* fill the data for the current frame */
- s->frame_offset = s->last_frame_offset;
- s->pts = s->last_pts;
- s->dts = s->last_dts;
-
- /* offset of the next frame */
- s->last_frame_offset = s->cur_offset + index;
- /* find the packet in which the new frame starts. It
- is tricky because of MPEG video start codes
- which can begin in one packet and finish in
- another packet. In the worst case, an MPEG
- video start code could be in 4 different
- packets. */
- k = s->cur_frame_start_index;
- for(i = 0; i < AV_PARSER_PTS_NB; i++) {
- if (s->last_frame_offset >= s->cur_frame_offset[k])
- break;
- k = (k - 1) & (AV_PARSER_PTS_NB - 1);
- }
+ s->frame_offset = s->next_frame_offset;
- s->last_pts = s->cur_frame_pts[k];
- s->last_dts = s->cur_frame_dts[k];
-
- /* some parsers tell us the packet size even before seeing the first byte of the next packet,
- so the next pts/dts is in the next chunk */
- if(index == buf_size){
- s->fetch_timestamp=1;
- }
+ /* offset of the next frame */
+ s->next_frame_offset = s->cur_offset + index;
+ s->fetch_timestamp=1;
}
if (index < 0)
index = 0;
return index;
}
+int av_parser_change(AVCodecParserContext *s,
+ AVCodecContext *avctx,
+ uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size, int keyframe){
+
+ if(s && s->parser->split){
+ if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
+ int i= s->parser->split(avctx, buf, buf_size);
+ buf += i;
+ buf_size -= i;
+ }
+ }
+
+ /* cast to avoid warning about discarding qualifiers */
+ *poutbuf= (uint8_t *) buf;
+ *poutbuf_size= buf_size;
+ if(avctx->extradata){
+ if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
+ /*||(s->pict_type != AV_PICTURE_TYPE_I && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/
+ /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
+ int size= buf_size + avctx->extradata_size;
+ *poutbuf_size= size;
+ *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
+
+ memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
+ memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
void av_parser_close(AVCodecParserContext *s)
{
- if (s->parser->parser_close)
- s->parser->parser_close(s);
- av_free(s->priv_data);
- av_free(s);
+ if(s){
+ if (s->parser->parser_close)
+ s->parser->parser_close(s);
+ av_free(s->priv_data);
+ av_free(s);
+ }
}
/*****************************************************/
-//#define END_NOT_FOUND (-100)
-
-#define PICTURE_START_CODE 0x00000100
-#define SEQ_START_CODE 0x000001b3
-#define EXT_START_CODE 0x000001b5
-#define SLICE_MIN_START_CODE 0x00000101
-#define SLICE_MAX_START_CODE 0x000001af
-
-typedef struct ParseContext1{
- ParseContext pc;
-/* XXX/FIXME PC1 vs. PC */
- /* MPEG2 specific */
- int frame_rate;
- int progressive_sequence;
- int width, height;
-
- /* XXX: suppress that, needed by MPEG4 */
- MpegEncContext *enc;
- int first_picture;
-} ParseContext1;
-
-/**
- * combines the (truncated) bitstream to a complete frame
- * @returns -1 if no complete frame could be created
- */
-int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size)
+int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
{
-#if 0
if(pc->overread){
- printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
- printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
+ av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
+ pc->overread, pc->state, next, pc->index, pc->overread_index);
+ av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
}
-#endif
- /* copy overreaded bytes from last frame into buffer */
+ /* Copy overread bytes from last frame into buffer. */
for(; pc->overread>0; pc->overread--){
pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
}
/* copy into buffer end return */
if(next == END_NOT_FOUND){
- pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
+ void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
+ if(!new_buffer)
+ return AVERROR(ENOMEM);
+ pc->buffer = new_buffer;
memcpy(&pc->buffer[pc->index], *buf, *buf_size);
pc->index += *buf_size;
return -1;
*buf_size=
pc->overread_index= pc->index + next;
-
+
/* append to buffer */
if(pc->index){
- pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
+ void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
+ if(!new_buffer)
+ return AVERROR(ENOMEM);
+ pc->buffer = new_buffer;
memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
pc->index = 0;
*buf= pc->buffer;
/* store overread bytes */
for(;next < 0; next++){
pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
+ pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next];
pc->overread++;
}
-#if 0
if(pc->overread){
- printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
- printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
+ av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
+ pc->overread, pc->state, next, pc->index, pc->overread_index);
+ av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
}
-#endif
return 0;
}
-static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
-{
- const uint8_t *buf_ptr;
- unsigned int state=0xFFFFFFFF, v;
- int val;
-
- buf_ptr = *pbuf_ptr;
- while (buf_ptr < buf_end) {
- v = *buf_ptr++;
- if (state == 0x000001) {
- state = ((state << 8) | v) & 0xffffff;
- val = state;
- goto found;
- }
- state = ((state << 8) | v) & 0xffffff;
- }
- val = -1;
- found:
- *pbuf_ptr = buf_ptr;
- return val;
-}
-
-/* XXX: merge with libavcodec ? */
-#define MPEG1_FRAME_RATE_BASE 1001
-
-static const int frame_rate_tab[16] = {
- 0,
- 24000,
- 24024,
- 25025,
- 30000,
- 30030,
- 50050,
- 60000,
- 60060,
- // Xing's 15fps: (9)
- 15015,
- // libmpeg3's "Unofficial economy rates": (10-13)
- 5005,
- 10010,
- 12012,
- 15015,
- // random, just to avoid segfault !never encode these
- 25025,
- 25025,
-};
-
-static void mpegvideo_extract_headers(AVCodecParserContext *s,
- AVCodecContext *avctx,
- const uint8_t *buf, int buf_size)
-{
- ParseContext1 *pc = s->priv_data;
- const uint8_t *buf_end;
- int32_t start_code;
- int frame_rate_index, ext_type, bytes_left;
- int frame_rate_ext_n, frame_rate_ext_d;
- int picture_structure, top_field_first, repeat_first_field, progressive_frame;
- int horiz_size_ext, vert_size_ext;
-
- s->repeat_pict = 0;
- buf_end = buf + buf_size;
- while (buf < buf_end) {
- start_code = find_start_code(&buf, buf_end);
- bytes_left = buf_end - buf;
- switch(start_code) {
- case PICTURE_START_CODE:
- if (bytes_left >= 2) {
- s->pict_type = (buf[1] >> 3) & 7;
- }
- break;
- case SEQ_START_CODE:
- if (bytes_left >= 4) {
- pc->width = (buf[0] << 4) | (buf[1] >> 4);
- pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
- avcodec_set_dimensions(avctx, pc->width, pc->height);
- frame_rate_index = buf[3] & 0xf;
- pc->frame_rate = avctx->frame_rate = frame_rate_tab[frame_rate_index];
- avctx->frame_rate_base = MPEG1_FRAME_RATE_BASE;
- avctx->codec_id = CODEC_ID_MPEG1VIDEO;
- avctx->sub_id = 1;
- }
- break;
- case EXT_START_CODE:
- if (bytes_left >= 1) {
- ext_type = (buf[0] >> 4);
- switch(ext_type) {
- case 0x1: /* sequence extension */
- if (bytes_left >= 6) {
- horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
- vert_size_ext = (buf[2] >> 5) & 3;
- frame_rate_ext_n = (buf[5] >> 5) & 3;
- frame_rate_ext_d = (buf[5] & 0x1f);
- pc->progressive_sequence = buf[1] & (1 << 3);
- avctx->has_b_frames= buf[5] >> 7;
-
- pc->width |=(horiz_size_ext << 12);
- pc->height |=( vert_size_ext << 12);
- avcodec_set_dimensions(avctx, pc->width, pc->height);
- avctx->frame_rate = pc->frame_rate * (frame_rate_ext_n + 1);
- avctx->frame_rate_base = MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d + 1);
- avctx->codec_id = CODEC_ID_MPEG2VIDEO;
- avctx->sub_id = 2; /* forces MPEG2 */
- }
- break;
- case 0x8: /* picture coding extension */
- if (bytes_left >= 5) {
- picture_structure = buf[2]&3;
- top_field_first = buf[3] & (1 << 7);
- repeat_first_field = buf[3] & (1 << 1);
- progressive_frame = buf[4] & (1 << 7);
-
- /* check if we must repeat the frame */
- if (repeat_first_field) {
- if (pc->progressive_sequence) {
- if (top_field_first)
- s->repeat_pict = 4;
- else
- s->repeat_pict = 2;
- } else if (progressive_frame) {
- s->repeat_pict = 1;
- }
- }
-
- /* the packet only represents half a frame
- XXX,FIXME maybe find a different solution */
- if(picture_structure != 3)
- s->repeat_pict = -1;
- }
- break;
- }
- }
- break;
- case -1:
- goto the_end;
- default:
- /* we stop parsing when we encounter a slice. It ensures
- that this function takes a negligible amount of time */
- if (start_code >= SLICE_MIN_START_CODE &&
- start_code <= SLICE_MAX_START_CODE)
- goto the_end;
- break;
- }
- }
- the_end: ;
-}
-
-static int mpegvideo_parse(AVCodecParserContext *s,
- AVCodecContext *avctx,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size)
-{
- ParseContext1 *pc1 = s->priv_data;
- ParseContext *pc= &pc1->pc;
- int next;
-
- next= ff_mpeg1_find_frame_end(pc, buf, buf_size);
-
- if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
- *poutbuf = NULL;
- *poutbuf_size = 0;
- return buf_size;
- }
- /* we have a full frame : we just parse the first few MPEG headers
- to have the full timing information. The time take by this
- function should be negligible for uncorrupted streams */
- mpegvideo_extract_headers(s, avctx, buf, buf_size);
-#if 0
- printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
- s->pict_type, (double)avctx->frame_rate / avctx->frame_rate_base, s->repeat_pict);
-#endif
-
- *poutbuf = (uint8_t *)buf;
- *poutbuf_size = buf_size;
- return next;
-}
-
void ff_parse_close(AVCodecParserContext *s)
{
ParseContext *pc = s->priv_data;
- av_free(pc->buffer);
-}
-
-static void parse1_close(AVCodecParserContext *s)
-{
- ParseContext1 *pc1 = s->priv_data;
-
- av_free(pc1->pc.buffer);
- av_free(pc1->enc);
+ av_freep(&pc->buffer);
}
/*************************/
-/* used by parser */
-/* XXX: make it use less memory */
-static int av_mpeg4_decode_header(AVCodecParserContext *s1,
- AVCodecContext *avctx,
- const uint8_t *buf, int buf_size)
-{
- ParseContext1 *pc = s1->priv_data;
- MpegEncContext *s = pc->enc;
- GetBitContext gb1, *gb = &gb1;
- int ret;
-
- s->avctx = avctx;
- s->current_picture_ptr = &s->current_picture;
-
- if (avctx->extradata_size && pc->first_picture){
- init_get_bits(gb, avctx->extradata, avctx->extradata_size*8);
- ret = ff_mpeg4_decode_picture_header(s, gb);
- }
-
- init_get_bits(gb, buf, 8 * buf_size);
- ret = ff_mpeg4_decode_picture_header(s, gb);
- if (s->width) {
- avcodec_set_dimensions(avctx, s->width, s->height);
- }
- pc->first_picture = 0;
- return ret;
-}
-
-static int mpeg4video_parse_init(AVCodecParserContext *s)
-{
- ParseContext1 *pc = s->priv_data;
-
- pc->enc = av_mallocz(sizeof(MpegEncContext));
- if (!pc->enc)
- return -1;
- pc->first_picture = 1;
- return 0;
-}
-
-static int mpeg4video_parse(AVCodecParserContext *s,
- AVCodecContext *avctx,
- uint8_t **poutbuf, int *poutbuf_size,
+int ff_mpeg4video_split(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
- ParseContext *pc = s->priv_data;
- int next;
-
- next= ff_mpeg4_find_frame_end(pc, buf, buf_size);
-
- if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
- *poutbuf = NULL;
- *poutbuf_size = 0;
- return buf_size;
- }
- av_mpeg4_decode_header(s, avctx, buf, buf_size);
-
- *poutbuf = (uint8_t *)buf;
- *poutbuf_size = buf_size;
- return next;
-}
-
-/*************************/
-
-typedef struct MpegAudioParseContext {
- uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */
- uint8_t *inbuf_ptr;
- int frame_size;
- int free_format_frame_size;
- int free_format_next_header;
- uint32_t header;
- int header_count;
-} MpegAudioParseContext;
-
-#define MPA_HEADER_SIZE 4
-
-/* header + layer + bitrate + freq + lsf/mpeg25 */
-#undef SAME_HEADER_MASK /* mpegaudio.h defines different version */
-#define SAME_HEADER_MASK \
- (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))
-
-static int mpegaudio_parse_init(AVCodecParserContext *s1)
-{
- MpegAudioParseContext *s = s1->priv_data;
- s->inbuf_ptr = s->inbuf;
- return 0;
-}
+ int i;
+ uint32_t state= -1;
-static int mpegaudio_parse(AVCodecParserContext *s1,
- AVCodecContext *avctx,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size)
-{
- MpegAudioParseContext *s = s1->priv_data;
- int len, ret, sr;
- uint32_t header;
- const uint8_t *buf_ptr;
-
- *poutbuf = NULL;
- *poutbuf_size = 0;
- buf_ptr = buf;
- while (buf_size > 0) {
- len = s->inbuf_ptr - s->inbuf;
- if (s->frame_size == 0) {
- /* special case for next header for first frame in free
- format case (XXX: find a simpler method) */
- if (s->free_format_next_header != 0) {
- s->inbuf[0] = s->free_format_next_header >> 24;
- s->inbuf[1] = s->free_format_next_header >> 16;
- s->inbuf[2] = s->free_format_next_header >> 8;
- s->inbuf[3] = s->free_format_next_header;
- s->inbuf_ptr = s->inbuf + 4;
- s->free_format_next_header = 0;
- goto got_header;
- }
- /* no header seen : find one. We need at least MPA_HEADER_SIZE
- bytes to parse it */
- len = MPA_HEADER_SIZE - len;
- if (len > buf_size)
- len = buf_size;
- if (len > 0) {
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- buf_size -= len;
- s->inbuf_ptr += len;
- }
- if ((s->inbuf_ptr - s->inbuf) >= MPA_HEADER_SIZE) {
- got_header:
- sr= avctx->sample_rate;
- header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
- (s->inbuf[2] << 8) | s->inbuf[3];
-
- ret = mpa_decode_header(avctx, header);
- if (ret < 0) {
- s->header_count= -2;
- /* no sync found : move by one byte (inefficient, but simple!) */
- memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
- s->inbuf_ptr--;
- dprintf("skip %x\n", header);
- /* reset free format frame size to give a chance
- to get a new bitrate */
- s->free_format_frame_size = 0;
- } else {
- if((header&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
- s->header_count= -3;
- s->header= header;
- s->header_count++;
- s->frame_size = ret;
-
-#if 0
- /* free format: prepare to compute frame size */
- if (decode_header(s, header) == 1) {
- s->frame_size = -1;
- }
-#endif
- }
- if(s->header_count <= 0)
- avctx->sample_rate= sr; //FIXME ugly
- }
- } else
-#if 0
- if (s->frame_size == -1) {
- /* free format : find next sync to compute frame size */
- len = MPA_MAX_CODED_FRAME_SIZE - len;
- if (len > buf_size)
- len = buf_size;
- if (len == 0) {
- /* frame too long: resync */
- s->frame_size = 0;
- memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
- s->inbuf_ptr--;
- } else {
- uint8_t *p, *pend;
- uint32_t header1;
- int padding;
-
- memcpy(s->inbuf_ptr, buf_ptr, len);
- /* check for header */
- p = s->inbuf_ptr - 3;
- pend = s->inbuf_ptr + len - 4;
- while (p <= pend) {
- header = (p[0] << 24) | (p[1] << 16) |
- (p[2] << 8) | p[3];
- header1 = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
- (s->inbuf[2] << 8) | s->inbuf[3];
- /* check with high probability that we have a
- valid header */
- if ((header & SAME_HEADER_MASK) ==
- (header1 & SAME_HEADER_MASK)) {
- /* header found: update pointers */
- len = (p + 4) - s->inbuf_ptr;
- buf_ptr += len;
- buf_size -= len;
- s->inbuf_ptr = p;
- /* compute frame size */
- s->free_format_next_header = header;
- s->free_format_frame_size = s->inbuf_ptr - s->inbuf;
- padding = (header1 >> 9) & 1;
- if (s->layer == 1)
- s->free_format_frame_size -= padding * 4;
- else
- s->free_format_frame_size -= padding;
- dprintf("free frame size=%d padding=%d\n",
- s->free_format_frame_size, padding);
- decode_header(s, header1);
- goto next_data;
- }
- p++;
- }
- /* not found: simply increase pointers */
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- }
- } else
-#endif
- if (len < s->frame_size) {
- if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE)
- s->frame_size = MPA_MAX_CODED_FRAME_SIZE;
- len = s->frame_size - len;
- if (len > buf_size)
- len = buf_size;
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- }
- // next_data:
- if (s->frame_size > 0 &&
- (s->inbuf_ptr - s->inbuf) >= s->frame_size) {
- if(s->header_count > 0){
- *poutbuf = s->inbuf;
- *poutbuf_size = s->inbuf_ptr - s->inbuf;
- }
- s->inbuf_ptr = s->inbuf;
- s->frame_size = 0;
- break;
- }
+ for(i=0; i<buf_size; i++){
+ state= (state<<8) | buf[i];
+ if(state == 0x1B3 || state == 0x1B6)
+ return i-3;
}
- return buf_ptr - buf;
-}
-
-#ifdef CONFIG_AC3
-extern int a52_syncinfo (const uint8_t * buf, int * flags,
- int * sample_rate, int * bit_rate);
-
-typedef struct AC3ParseContext {
- uint8_t inbuf[4096]; /* input buffer */
- uint8_t *inbuf_ptr;
- int frame_size;
- int flags;
-} AC3ParseContext;
-
-#define AC3_HEADER_SIZE 7
-#define A52_LFE 16
-
-static int ac3_parse_init(AVCodecParserContext *s1)
-{
- AC3ParseContext *s = s1->priv_data;
- s->inbuf_ptr = s->inbuf;
return 0;
}
-
-static int ac3_parse(AVCodecParserContext *s1,
- AVCodecContext *avctx,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size)
-{
- AC3ParseContext *s = s1->priv_data;
- const uint8_t *buf_ptr;
- int len, sample_rate, bit_rate;
- static const int ac3_channels[8] = {
- 2, 1, 2, 3, 3, 4, 4, 5
- };
-
- *poutbuf = NULL;
- *poutbuf_size = 0;
-
- buf_ptr = buf;
- while (buf_size > 0) {
- len = s->inbuf_ptr - s->inbuf;
- if (s->frame_size == 0) {
- /* no header seen : find one. We need at least 7 bytes to parse it */
- len = AC3_HEADER_SIZE - len;
- if (len > buf_size)
- len = buf_size;
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- if ((s->inbuf_ptr - s->inbuf) == AC3_HEADER_SIZE) {
- len = a52_syncinfo(s->inbuf, &s->flags, &sample_rate, &bit_rate);
- if (len == 0) {
- /* no sync found : move by one byte (inefficient, but simple!) */
- memmove(s->inbuf, s->inbuf + 1, AC3_HEADER_SIZE - 1);
- s->inbuf_ptr--;
- } else {
- s->frame_size = len;
- /* update codec info */
- avctx->sample_rate = sample_rate;
- /* set channels,except if the user explicitly requests 1 or 2 channels, XXX/FIXME this is a bit ugly */
- if(avctx->channels!=1 && avctx->channels!=2){
- avctx->channels = ac3_channels[s->flags & 7];
- if (s->flags & A52_LFE)
- avctx->channels++;
- }
- avctx->bit_rate = bit_rate;
- avctx->frame_size = 6 * 256;
- }
- }
- } else if (len < s->frame_size) {
- len = s->frame_size - len;
- if (len > buf_size)
- len = buf_size;
-
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- } else {
- *poutbuf = s->inbuf;
- *poutbuf_size = s->frame_size;
- s->inbuf_ptr = s->inbuf;
- s->frame_size = 0;
- break;
- }
- }
- return buf_ptr - buf;
-}
-#endif
-
-AVCodecParser mpegvideo_parser = {
- { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
- sizeof(ParseContext1),
- NULL,
- mpegvideo_parse,
- parse1_close,
-};
-
-AVCodecParser mpeg4video_parser = {
- { CODEC_ID_MPEG4 },
- sizeof(ParseContext1),
- mpeg4video_parse_init,
- mpeg4video_parse,
- parse1_close,
-};
-
-AVCodecParser mpegaudio_parser = {
- { CODEC_ID_MP2, CODEC_ID_MP3 },
- sizeof(MpegAudioParseContext),
- mpegaudio_parse_init,
- mpegaudio_parse,
- NULL,
-};
-
-#ifdef CONFIG_AC3
-AVCodecParser ac3_parser = {
- { CODEC_ID_AC3 },
- sizeof(AC3ParseContext),
- ac3_parse_init,
- ac3_parse,
- NULL,
-};
-#endif