* 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 FFmpeg.
+ *
+ * FFmpeg 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,
+ * FFmpeg 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
+ * License along with FFmpeg; 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"
+#include "parser.h"
AVCodecParser *av_first_parser = NULL;
return s;
}
-/* NOTE: buf_size == 0 is used to signal EOF so that the last frame
- can be returned if necessary */
+/**
+ *
+ * @param buf input
+ * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output)
+ * @param pts input presentation timestamp
+ * @param dts input decoding timestamp
+ * @param poutbuf will contain a pointer to the first byte of the output frame
+ * @param poutbuf_size will contain the length of the output frame
+ * @return the number of bytes of the input bitstream used
+ *
+ * Example:
+ * @code
+ * while(in_len){
+ * len = av_parser_parse(myparser, AVCodecContext, &data, &size,
+ * in_data, in_len,
+ * pts, dts);
+ * in_data += len;
+ * in_len -= len;
+ *
+ * if(size)
+ * decode_frame(data, size);
+ * }
+ * @endcode
+ */
int av_parser_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
/* 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);
+//av_log(NULL, AV_LOG_DEBUG, "parser: in:%"PRId64", %"PRId64", out:%"PRId64", %"PRId64", in:%d out:%d id:%d\n", pts, dts, s->last_pts, s->last_dts, buf_size, *poutbuf_size, avctx->codec_id);
/* update the file pointer */
if (*poutbuf_size) {
/* fill the data for the current frame */
/**
*
* @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
+ * @deprecated use AVBitstreamFilter
*/
int av_parser_change(AVCodecParserContext *s,
AVCodecContext *avctx,
/*****************************************************/
-//#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
return 0;
}
-/* 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,
-};
-
-//FIXME move into mpeg12.c
-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, bit_rate_ext;
-//FIXME replace the crap with get_bits()
- s->repeat_pict = 0;
- buf_end = buf + buf_size;
- while (buf < buf_end) {
- start_code= -1;
- buf= ff_find_start_code(buf, buf_end, &start_code);
- 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 >= 7) {
- 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->time_base.den = frame_rate_tab[frame_rate_index];
- avctx->time_base.num = MPEG1_FRAME_RATE_BASE;
- avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
- 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;
- bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
- 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);
- avctx->bit_rate += (bit_rate_ext << 18) * 400;
- avcodec_set_dimensions(avctx, pc->width, pc->height);
- avctx->time_base.den = pc->frame_rate * (frame_rate_ext_n + 1);
- avctx->time_base.num = 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;
-
- if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
- next= buf_size;
- }else{
- 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->time_base.den / avctx->time_base.num, s->repeat_pict);
-#endif
-
- *poutbuf = (uint8_t *)buf;
- *poutbuf_size = buf_size;
- return next;
-}
-
-static int mpegvideo_split(AVCodecContext *avctx,
- const uint8_t *buf, int buf_size)
-{
- int i;
- uint32_t state= -1;
-
- for(i=0; i<buf_size; i++){
- state= (state<<8) | buf[i];
- if(state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100)
- return i-3;
- }
- return 0;
-}
-
void ff_parse_close(AVCodecParserContext *s)
{
ParseContext *pc = s->priv_data;
av_free(pc->buffer);
}
-static void parse1_close(AVCodecParserContext *s)
+void ff_parse1_close(AVCodecParserContext *s)
{
ParseContext1 *pc1 = s->priv_data;
/*************************/
+#ifdef CONFIG_MPEG4VIDEO_PARSER
/* used by parser */
/* XXX: make it use less memory */
static int av_mpeg4_decode_header(AVCodecParserContext *s1,
*poutbuf_size = buf_size;
return next;
}
+#endif
-static int mpeg4video_split(AVCodecContext *avctx,
+int ff_mpeg4video_split(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
int i;
/*************************/
+#ifdef CONFIG_MPEGAUDIO_PARSER
typedef struct MpegAudioParseContext {
uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */
uint8_t *inbuf_ptr;
}
/* 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;
+ len = FFMIN(MPA_HEADER_SIZE - len, buf_size);
if (len > 0) {
memcpy(s->inbuf_ptr, buf_ptr, len);
buf_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);
+ ret = mpa_decode_header(avctx, header, &sr);
if (ret < 0) {
s->header_count= -2;
/* no sync found : move by one byte (inefficient, but simple!) */
}
#endif
}
- if(s->header_count <= 0)
- avctx->sample_rate= sr; //FIXME ugly
+ if(s->header_count > 1)
+ avctx->sample_rate= sr;
}
} else
#if 0
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;
+ len = FFMIN(s->frame_size - len, buf_size);
memcpy(s->inbuf_ptr, buf_ptr, len);
buf_ptr += len;
s->inbuf_ptr += len;
buf_size -= len;
}
+
+ if(s->frame_size > 0 && buf_ptr - buf == s->inbuf_ptr - s->inbuf
+ && buf_size + buf_ptr - buf >= s->frame_size){
+ if(s->header_count > 0){
+ *poutbuf = buf;
+ *poutbuf_size = s->frame_size;
+ }
+ buf_ptr = buf + s->frame_size;
+ s->inbuf_ptr = s->inbuf;
+ s->frame_size = 0;
+ break;
+ }
+
// next_data:
if (s->frame_size > 0 &&
(s->inbuf_ptr - s->inbuf) >= s->frame_size) {
}
return buf_ptr - buf;
}
+#endif /* CONFIG_MPEGAUDIO_PARSER */
+#if defined(CONFIG_AC3_PARSER) || defined(CONFIG_AAC_PARSER)
+/* also used for ADTS AAC */
typedef struct AC3ParseContext {
- uint8_t inbuf[4096]; /* input buffer */
uint8_t *inbuf_ptr;
int frame_size;
+ int header_size;
+ int (*sync)(const uint8_t *buf, int *channels, int *sample_rate,
+ int *bit_rate, int *samples);
+ uint8_t inbuf[8192]; /* input buffer */
} AC3ParseContext;
#define AC3_HEADER_SIZE 7
+#define AAC_HEADER_SIZE 7
+#ifdef CONFIG_AC3_PARSER
static const int ac3_sample_rates[4] = {
48000, 44100, 32000, 0
};
static const int ac3_channels[8] = {
2, 1, 2, 3, 3, 4, 4, 5
};
+#endif /* CONFIG_AC3_PARSER */
+
+#ifdef CONFIG_AAC_PARSER
+static const int aac_sample_rates[16] = {
+ 96000, 88200, 64000, 48000, 44100, 32000,
+ 24000, 22050, 16000, 12000, 11025, 8000, 7350
+};
+static const int aac_channels[8] = {
+ 0, 1, 2, 3, 4, 5, 6, 8
+};
+#endif
+
+#ifdef CONFIG_AC3_PARSER
static int ac3_sync(const uint8_t *buf, int *channels, int *sample_rate,
- int *bit_rate)
+ int *bit_rate, int *samples)
{
unsigned int fscod, frmsizecod, acmod, bsid, lfeon;
GetBitContext bits;
if(get_bits(&bits, 16) != 0x0b77)
return 0;
- get_bits(&bits, 16); /* crc */
+ skip_bits(&bits, 16); /* crc */
fscod = get_bits(&bits, 2);
frmsizecod = get_bits(&bits, 6);
bsid = get_bits(&bits, 5);
if(bsid > 8)
return 0;
- get_bits(&bits, 3); /* bsmod */
+ skip_bits(&bits, 3); /* bsmod */
acmod = get_bits(&bits, 3);
if(acmod & 1 && acmod != 1)
- get_bits(&bits, 2); /* cmixlev */
+ skip_bits(&bits, 2); /* cmixlev */
if(acmod & 4)
- get_bits(&bits, 2); /* surmixlev */
+ skip_bits(&bits, 2); /* surmixlev */
if(acmod & 2)
- get_bits(&bits, 2); /* dsurmod */
- lfeon = get_bits(&bits, 1);
+ skip_bits(&bits, 2); /* dsurmod */
+ lfeon = get_bits1(&bits);
*sample_rate = ac3_sample_rates[fscod];
*bit_rate = ac3_bitrates[frmsizecod] * 1000;
*channels = ac3_channels[acmod] + lfeon;
+ *samples = 6 * 256;
return ac3_frame_sizes[frmsizecod][fscod] * 2;
}
+#endif /* CONFIG_AC3_PARSER */
+
+#ifdef CONFIG_AAC_PARSER
+static int aac_sync(const uint8_t *buf, int *channels, int *sample_rate,
+ int *bit_rate, int *samples)
+{
+ GetBitContext bits;
+ int size, rdb, ch, sr;
+
+ init_get_bits(&bits, buf, AAC_HEADER_SIZE * 8);
+ if(get_bits(&bits, 12) != 0xfff)
+ return 0;
+
+ skip_bits1(&bits); /* id */
+ skip_bits(&bits, 2); /* layer */
+ skip_bits1(&bits); /* protection_absent */
+ skip_bits(&bits, 2); /* profile_objecttype */
+ sr = get_bits(&bits, 4); /* sample_frequency_index */
+ if(!aac_sample_rates[sr])
+ return 0;
+ skip_bits1(&bits); /* private_bit */
+ ch = get_bits(&bits, 3); /* channel_configuration */
+ if(!aac_channels[ch])
+ return 0;
+ skip_bits1(&bits); /* original/copy */
+ skip_bits1(&bits); /* home */
+
+ /* adts_variable_header */
+ skip_bits1(&bits); /* copyright_identification_bit */
+ skip_bits1(&bits); /* copyright_identification_start */
+ size = get_bits(&bits, 13); /* aac_frame_length */
+ skip_bits(&bits, 11); /* adts_buffer_fullness */
+ rdb = get_bits(&bits, 2); /* number_of_raw_data_blocks_in_frame */
+
+ *channels = aac_channels[ch];
+ *sample_rate = aac_sample_rates[sr];
+ *samples = (rdb + 1) * 1024;
+ *bit_rate = size * 8 * *sample_rate / *samples;
+
+ return size;
+}
+#endif /* CONFIG_AAC_PARSER */
+
+#ifdef CONFIG_AC3_PARSER
static int ac3_parse_init(AVCodecParserContext *s1)
{
AC3ParseContext *s = s1->priv_data;
s->inbuf_ptr = s->inbuf;
+ s->header_size = AC3_HEADER_SIZE;
+ s->sync = ac3_sync;
return 0;
}
+#endif
+#ifdef CONFIG_AAC_PARSER
+static int aac_parse_init(AVCodecParserContext *s1)
+{
+ AC3ParseContext *s = s1->priv_data;
+ s->inbuf_ptr = s->inbuf;
+ s->header_size = AAC_HEADER_SIZE;
+ s->sync = aac_sync;
+ return 0;
+}
+#endif
+
+/* also used for ADTS AAC */
static int ac3_parse(AVCodecParserContext *s1,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
{
AC3ParseContext *s = s1->priv_data;
const uint8_t *buf_ptr;
- int len, sample_rate, bit_rate, channels;
+ int len, sample_rate, bit_rate, channels, samples;
*poutbuf = NULL;
*poutbuf_size = 0;
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 = FFMIN(AC3_HEADER_SIZE - len, buf_size);
+ /* no header seen : find one. We need at least s->header_size
+ bytes to parse it */
+ len = FFMIN(s->header_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 = ac3_sync(s->inbuf, &channels, &sample_rate, &bit_rate);
+ if ((s->inbuf_ptr - s->inbuf) == s->header_size) {
+ len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate,
+ &samples);
if (len == 0) {
/* no sync found : move by one byte (inefficient, but simple!) */
- memmove(s->inbuf, s->inbuf + 1, AC3_HEADER_SIZE - 1);
+ memmove(s->inbuf, s->inbuf + 1, s->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){
+ if(avctx->codec_id == CODEC_ID_AC3){
+ if(avctx->channels!=1 && avctx->channels!=2){
+ avctx->channels = channels;
+ }
+ } else {
avctx->channels = channels;
}
avctx->bit_rate = bit_rate;
- avctx->frame_size = 6 * 256;
+ avctx->frame_size = samples;
}
}
} else {
}
return buf_ptr - buf;
}
+#endif /* CONFIG_AC3_PARSER || CONFIG_AAC_PARSER */
-AVCodecParser mpegvideo_parser = {
- { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
- sizeof(ParseContext1),
- NULL,
- mpegvideo_parse,
- parse1_close,
- mpegvideo_split,
-};
-
+#ifdef CONFIG_MPEG4VIDEO_PARSER
AVCodecParser mpeg4video_parser = {
{ CODEC_ID_MPEG4 },
sizeof(ParseContext1),
mpeg4video_parse_init,
mpeg4video_parse,
- parse1_close,
- mpeg4video_split,
+ ff_parse1_close,
+ ff_mpeg4video_split,
};
-
+#endif
+#ifdef CONFIG_MPEGAUDIO_PARSER
AVCodecParser mpegaudio_parser = {
{ CODEC_ID_MP2, CODEC_ID_MP3 },
sizeof(MpegAudioParseContext),
mpegaudio_parse,
NULL,
};
-
+#endif
+#ifdef CONFIG_AC3_PARSER
AVCodecParser ac3_parser = {
{ CODEC_ID_AC3 },
sizeof(AC3ParseContext),
ac3_parse,
NULL,
};
+#endif
+#ifdef CONFIG_AAC_PARSER
+AVCodecParser aac_parser = {
+ { CODEC_ID_AAC },
+ sizeof(AC3ParseContext),
+ aac_parse_init,
+ ac3_parse,
+ NULL,
+};
+#endif
projects / ffmpeg / blobdiff