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DVB subtitle decoder by (Ian Caulfield: imc25, cam ac uk)

Browse source 
Originally committed as revision 4448 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-07-17 00:28:12 +00:00
parent 6e5c1877b2
commit c6ec28b18c
9 changed files with 1944 additions and 176 deletions
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226
libavformat/mpegts.c
View file

@ -30,7 +30,10 @@
synchronisation is lost */
#define MAX_RESYNC_SIZE 4096
static int add_pes_stream(MpegTSContext *ts, int pid, int stream_type);
typedef struct PESContext PESContext;
static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int stream_type);
static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
enum MpegTSFilterType {
MPEGTS_PES,
@ -368,8 +371,13 @@ static void pmt_cb(void *opaque, const uint8_t *section, int section_len)
{
MpegTSContext *ts = opaque;
SectionHeader h1, *h = &h1;
const uint8_t *p, *p_end;
int program_info_length, pcr_pid, pid, stream_type, desc_length;
PESContext *pes;
AVStream *st;
const uint8_t *p, *p_end, *desc_list_end, *desc_end;
int program_info_length, pcr_pid, pid, stream_type;
int desc_list_len, desc_len, desc_tag;
int comp_page, anc_page;
char language[4];
#ifdef DEBUG_SI
printf("PMT:\n");
@ -399,18 +407,57 @@ static void pmt_cb(void *opaque, const uint8_t *section, int section_len)
if (p >= p_end)
return;
for(;;) {
language[0] = 0;
st = 0;
stream_type = get8(&p, p_end);
if (stream_type < 0)
break;
pid = get16(&p, p_end) & 0x1fff;
if (pid < 0)
break;
desc_length = get16(&p, p_end) & 0xfff;
if (desc_length < 0)
desc_list_len = get16(&p, p_end) & 0xfff;
if (desc_list_len < 0)
break;
p += desc_length;
if (p > p_end)
return;
desc_list_end = p + desc_list_len;
if (desc_list_end > p_end)
break;
for(;;) {
desc_tag = get8(&p, desc_list_end);
if (desc_tag < 0)
break;
desc_len = get8(&p, desc_list_end);
desc_end = p + desc_len;
if (desc_end > desc_list_end)
break;
#ifdef DEBUG_SI
printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);
#endif
switch(desc_tag) {
case DVB_SUBT_DESCID:
if (stream_type == STREAM_TYPE_PRIVATE_DATA)
stream_type = STREAM_TYPE_SUBTITLE_DVB;
language[0] = get8(&p, desc_end);
language[1] = get8(&p, desc_end);
language[2] = get8(&p, desc_end);
language[3] = 0;
get8(&p, desc_end);
comp_page = get16(&p, desc_end);
anc_page = get16(&p, desc_end);
break;
case 0x0a: /* ISO 639 language descriptor */
language[0] = get8(&p, desc_end);
language[1] = get8(&p, desc_end);
language[2] = get8(&p, desc_end);
language[3] = 0;
break;
default:
break;
}
p = desc_end;
}
p = desc_list_end;
#ifdef DEBUG_SI
printf("stream_type=%d pid=0x%x\n", stream_type, pid);
@ -427,12 +474,28 @@ static void pmt_cb(void *opaque, const uint8_t *section, int section_len)
case STREAM_TYPE_AUDIO_AAC:
case STREAM_TYPE_AUDIO_AC3:
case STREAM_TYPE_AUDIO_DTS:
add_pes_stream(ts, pid, stream_type);
case STREAM_TYPE_SUBTITLE_DVB:
pes = add_pes_stream(ts, pid, stream_type);
if (pes)
st = new_pes_av_stream(pes, 0);
break;
default:
/* we ignore the other streams */
break;
}
if (st) {
if (language[0] != 0) {
st->language[0] = language[0];
st->language[1] = language[1];
st->language[2] = language[2];
st->language[3] = language[3];
}
if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
st->codec.sub_id = (anc_page << 16) | comp_page;
}
}
}
/* all parameters are there */
ts->set_service_cb(ts->set_service_opaque, 0);
@ -653,7 +716,7 @@ enum MpegTSState {
#define PES_START_SIZE 9
#define MAX_PES_HEADER_SIZE (9 + 255)
typedef struct PESContext {
struct PESContext {
int pid;
int stream_type;
MpegTSContext *ts;
@ -666,7 +729,7 @@ typedef struct PESContext {
int pes_header_size;
int64_t pts, dts;
uint8_t header[MAX_PES_HEADER_SIZE];
} PESContext;
};
static int64_t get_pts(const uint8_t *p)
{
@ -687,9 +750,8 @@ static void mpegts_push_data(void *opaque,
{
PESContext *pes = opaque;
MpegTSContext *ts = pes->ts;
AVStream *st;
const uint8_t *p;
int len, code, codec_type, codec_id;
int len, code;
if (is_start) {
pes->state = MPEGTS_HEADER;
@ -722,59 +784,7 @@ static void mpegts_push_data(void *opaque,
goto skip;
if (!pes->st) {
/* allocate stream */
switch(pes->stream_type){
case STREAM_TYPE_AUDIO_MPEG1:
case STREAM_TYPE_AUDIO_MPEG2:
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_MP3;
break;
case STREAM_TYPE_VIDEO_MPEG1:
case STREAM_TYPE_VIDEO_MPEG2:
codec_type = CODEC_TYPE_VIDEO;
codec_id = CODEC_ID_MPEG2VIDEO;
break;
case STREAM_TYPE_VIDEO_MPEG4:
codec_type = CODEC_TYPE_VIDEO;
codec_id = CODEC_ID_MPEG4;
break;
case STREAM_TYPE_VIDEO_H264:
codec_type = CODEC_TYPE_VIDEO;
codec_id = CODEC_ID_H264;
break;
case STREAM_TYPE_AUDIO_AAC:
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_AAC;
break;
case STREAM_TYPE_AUDIO_AC3:
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_AC3;
break;
case STREAM_TYPE_AUDIO_DTS:
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_DTS;
break;
default:
if (code >= 0x1c0 && code <= 0x1df) {
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_MP2;
} else if (code == 0x1bd) {
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_AC3;
} else {
codec_type = CODEC_TYPE_VIDEO;
codec_id = CODEC_ID_MPEG1VIDEO;
}
break;
}
st = av_new_stream(pes->stream, pes->pid);
if (st) {
av_set_pts_info(st, 33, 1, 90000);
st->priv_data = pes;
st->codec.codec_type = codec_type;
st->codec.codec_id = codec_id;
st->need_parsing = 1;
pes->st = st;
}
new_pes_av_stream(pes, code);
}
pes->state = MPEGTS_PESHEADER_FILL;
pes->total_size = (pes->header[4] << 8) | pes->header[5];
@ -854,7 +864,73 @@ static void mpegts_push_data(void *opaque,
}
}
static int add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
{
AVStream *st;
int codec_type, codec_id;
switch(pes->stream_type){
case STREAM_TYPE_AUDIO_MPEG1:
case STREAM_TYPE_AUDIO_MPEG2:
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_MP3;
break;
case STREAM_TYPE_VIDEO_MPEG1:
case STREAM_TYPE_VIDEO_MPEG2:
codec_type = CODEC_TYPE_VIDEO;
codec_id = CODEC_ID_MPEG2VIDEO;
break;
case STREAM_TYPE_VIDEO_MPEG4:
codec_type = CODEC_TYPE_VIDEO;
codec_id = CODEC_ID_MPEG4;
break;
case STREAM_TYPE_VIDEO_H264:
codec_type = CODEC_TYPE_VIDEO;
codec_id = CODEC_ID_H264;
break;
case STREAM_TYPE_AUDIO_AAC:
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_AAC;
break;
case STREAM_TYPE_AUDIO_AC3:
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_AC3;
break;
case STREAM_TYPE_AUDIO_DTS:
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_DTS;
break;
case STREAM_TYPE_SUBTITLE_DVB:
codec_type = CODEC_TYPE_SUBTITLE;
codec_id = CODEC_ID_DVB_SUBTITLE;
break;
default:
if (code >= 0x1c0 && code <= 0x1df) {
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_MP2;
} else if (code == 0x1bd) {
codec_type = CODEC_TYPE_AUDIO;
codec_id = CODEC_ID_AC3;
} else {
codec_type = CODEC_TYPE_VIDEO;
codec_id = CODEC_ID_MPEG1VIDEO;
}
break;
}
st = av_new_stream(pes->stream, pes->pid);
if (st) {
av_set_pts_info(st, 33, 1, 90000);
st->priv_data = pes;
st->codec.codec_type = codec_type;
st->codec.codec_id = codec_id;
st->need_parsing = 1;
pes->st = st;
}
return st;
}
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
{
MpegTSFilter *tss;
PESContext *pes;
@ -862,7 +938,7 @@ static int add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
/* if no pid found, then add a pid context */
pes = av_mallocz(sizeof(PESContext));
if (!pes)
return -1;
return 0;
pes->ts = ts;
pes->stream = ts->stream;
pes->pid = pid;
@ -870,9 +946,9 @@ static int add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
if (!tss) {
av_free(pes);
return -1;
return 0;
}
return 0;
return pes;
}
/* handle one TS packet */
@ -1131,11 +1207,11 @@ static int mpegts_read_header(AVFormatContext *s,
}
if (ts->nb_services <= 0) {
/* raw transport stream */
ts->auto_guess = 1;
s->ctx_flags |= AVFMTCTX_NOHEADER;
goto do_pcr;
}
/* raw transport stream */
ts->auto_guess = 1;
s->ctx_flags |= AVFMTCTX_NOHEADER;
goto do_pcr;
}
/* tune to first service found */
for(i=0; i<ts->nb_services && ts->set_service_ret; i++){