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Code Issues Releases Activity

support for older real audio files (<= version 3)

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Originally committed as revision 2119 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2003-08-11 16:16:49 +00:00
parent 62563c38d0
commit c95108037f
1 changed files with 166 additions and 87 deletions
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137
libavformat/rm.c
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@ -39,6 +39,7 @@ typedef struct {
StreamInfo *audio_stream, *video_stream;
int data_pos; /* position of the data after the header */
int nb_packets;
int old_format;
} RMContext;
static void put_str(ByteIOContext *s, const char *tag)
@ -465,6 +466,85 @@ static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
*q = '\0';
}
static void rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
int read_all)
{
ByteIOContext *pb = &s->pb;
char buf[128];
uint32_t version;
int i;
/* ra type header */
version = get_be32(pb); /* version */
if (((version >> 16) & 0xff) == 3) {
/* very old version */
for(i = 0; i < 14; i++)
get_byte(pb);
get_str8(pb, s->title, sizeof(s->title));
get_str8(pb, s->author, sizeof(s->author));
get_str8(pb, s->copyright, sizeof(s->copyright));
get_str8(pb, s->comment, sizeof(s->comment));
get_byte(pb);
get_str8(pb, buf, sizeof(buf));
st->codec.sample_rate = 8000;
st->codec.channels = 1;
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_id = CODEC_ID_RA_144;
} else {
/* old version (4) */
get_be32(pb); /* .ra4 */
get_be32(pb);
get_be16(pb);
get_be32(pb); /* header size */
get_be16(pb); /* add codec info */
get_be32(pb); /* coded frame size */
get_be32(pb); /* ??? */
get_be32(pb); /* ??? */
get_be32(pb); /* ??? */
get_be16(pb); /* 1 */
get_be16(pb); /* coded frame size */
get_be32(pb);
st->codec.sample_rate = get_be16(pb);
get_be32(pb);
st->codec.channels = get_be16(pb);
get_str8(pb, buf, sizeof(buf)); /* desc */
get_str8(pb, buf, sizeof(buf)); /* desc */
st->codec.codec_type = CODEC_TYPE_AUDIO;
if (!strcmp(buf, "dnet")) {
st->codec.codec_id = CODEC_ID_AC3;
} else {
st->codec.codec_id = CODEC_ID_NONE;
pstrcpy(st->codec.codec_name, sizeof(st->codec.codec_name),
buf);
}
if (read_all) {
get_byte(pb);
get_byte(pb);
get_byte(pb);
get_str8(pb, s->title, sizeof(s->title));
get_str8(pb, s->author, sizeof(s->author));
get_str8(pb, s->copyright, sizeof(s->copyright));
get_str8(pb, s->comment, sizeof(s->comment));
}
}
}
static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
{
RMContext *rm = s->priv_data;
AVStream *st;
rm->old_format = 1;
st = av_new_stream(s, 0);
if (!st)
goto fail;
rm_read_audio_stream_info(s, st, 1);
return 0;
fail:
return -1;
}
static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
RMContext *rm = s->priv_data;
@ -477,8 +557,13 @@ static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
char buf[128];
int flags = 0;
if (get_le32(pb) != MKTAG('.', 'R', 'M', 'F'))
tag = get_le32(pb);
if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
/* very old .ra format */
return rm_read_header_old(s, ap);
} else if (tag != MKTAG('.', 'R', 'M', 'F')) {
return -EIO;
}
get_be32(pb); /* header size */
get_be16(pb);
@ -545,32 +630,7 @@ static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
v = get_be32(pb);
if (v == MKTAG(0xfd, 'a', 'r', '.')) {
/* ra type header */
get_be32(pb); /* version */
get_be32(pb); /* .ra4 */
get_be32(pb);
get_be16(pb);
get_be32(pb); /* header size */
get_be16(pb); /* add codec info */
get_be32(pb); /* coded frame size */
get_be32(pb); /* ??? */
get_be32(pb); /* ??? */
get_be32(pb); /* ??? */
get_be16(pb); /* 1 */
get_be16(pb); /* coded frame size */
get_be32(pb);
st->codec.sample_rate = get_be16(pb);
get_be32(pb);
st->codec.channels = get_be16(pb);
get_str8(pb, buf, sizeof(buf)); /* desc */
get_str8(pb, buf, sizeof(buf)); /* desc */
st->codec.codec_type = CODEC_TYPE_AUDIO;
if (!strcmp(buf, "dnet")) {
st->codec.codec_id = CODEC_ID_AC3;
} else {
st->codec.codec_id = CODEC_ID_NONE;
pstrcpy(st->codec.codec_name, sizeof(st->codec.codec_name),
buf);
}
rm_read_audio_stream_info(s, st, 0);
} else {
if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
fail1:
@ -645,6 +705,9 @@ static int get_num(ByteIOContext *pb, int *len)
}
}
/* multiple of 20 bytes for ra144 (ugly) */
#define RAW_PACKET_SIZE 1000
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
RMContext *rm = s->priv_data;
@ -654,6 +717,19 @@ static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
uint8_t *ptr;
int flags;
if (rm->old_format) {
/* just read raw bytes */
len = RAW_PACKET_SIZE;
av_new_packet(pkt, len);
pkt->stream_index = 0;
len = get_buffer(pb, pkt->data, len);
if (len <= 0) {
av_free_packet(pkt);
return -EIO;
}
pkt->size = len;
st = s->streams[0];
} else {
redo:
if (rm->nb_packets == 0)
return -EIO;
@ -713,6 +789,7 @@ static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
av_new_packet(pkt, len);
pkt->stream_index = i;
get_buffer(pb, pkt->data, len);
}
/* for AC3, needs to swap bytes */
if (st->codec.codec_id == CODEC_ID_AC3) {
@ -737,9 +814,11 @@ static int rm_probe(AVProbeData *p)
/* check file header */
if (p->buf_size <= 32)
return 0;
if (p->buf[0] == '.' && p->buf[1] == 'R' &&
if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
p->buf[2] == 'M' && p->buf[3] == 'F' &&
p->buf[4] == 0 && p->buf[5] == 0)
p->buf[4] == 0 && p->buf[5] == 0) ||
(p->buf[0] == '.' && p->buf[1] == 'r' &&
p->buf[2] == 'a' && p->buf[3] == 0xfd))
return AVPROBE_SCORE_MAX;
else
return 0;