0,0 → 1,196 |
/* |
* QCP format (.qcp) demuxer |
* Copyright (c) 2009 Kenan Gillet |
* |
* 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 2.1 of the License, or (at your option) any later version. |
* |
* 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 FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/** |
* @file |
* QCP format (.qcp) demuxer |
* @author Kenan Gillet |
* @see RFC 3625: "The QCP File Format and Media Types for Speech Data" |
* http://tools.ietf.org/html/rfc3625 |
*/ |
|
#include "libavutil/channel_layout.h" |
#include "libavutil/intreadwrite.h" |
#include "avformat.h" |
|
typedef struct { |
uint32_t data_size; ///< size of data chunk |
|
#define QCP_MAX_MODE 4 |
int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding |
///< to each mode, -1 if no size. |
} QCPContext; |
|
/** |
* Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file; |
* the first byte of the GUID can be either 0x41 or 0x42. |
*/ |
static const uint8_t guid_qcelp_13k_part[15] = { |
0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba, |
0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e |
}; |
|
/** |
* EVRC GUID as stored in the file |
*/ |
static const uint8_t guid_evrc[16] = { |
0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46, |
0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4 |
}; |
|
/** |
* SMV GUID as stored in the file |
*/ |
static const uint8_t guid_smv[16] = { |
0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed, |
0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84 |
}; |
|
/** |
* @param guid contains at least 16 bytes |
* @return 1 if the guid is a qcelp_13k guid, 0 otherwise |
*/ |
static int is_qcelp_13k_guid(const uint8_t *guid) { |
return (guid[0] == 0x41 || guid[0] == 0x42) |
&& !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part)); |
} |
|
static int qcp_probe(AVProbeData *pd) |
{ |
if (AV_RL32(pd->buf ) == AV_RL32("RIFF") && |
AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt ")) |
return AVPROBE_SCORE_MAX; |
return 0; |
} |
|
static int qcp_read_header(AVFormatContext *s) |
{ |
AVIOContext *pb = s->pb; |
QCPContext *c = s->priv_data; |
AVStream *st = avformat_new_stream(s, NULL); |
uint8_t buf[16]; |
int i, nb_rates; |
|
if (!st) |
return AVERROR(ENOMEM); |
|
avio_rb32(pb); // "RIFF" |
avio_skip(pb, 4 + 8 + 4 + 1 + 1); // filesize + "QLCMfmt " + chunk-size + major-version + minor-version |
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
st->codec->channels = 1; |
st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
avio_read(pb, buf, 16); |
if (is_qcelp_13k_guid(buf)) { |
st->codec->codec_id = AV_CODEC_ID_QCELP; |
} else if (!memcmp(buf, guid_evrc, 16)) { |
st->codec->codec_id = AV_CODEC_ID_EVRC; |
} else if (!memcmp(buf, guid_smv, 16)) { |
st->codec->codec_id = AV_CODEC_ID_SMV; |
} else { |
av_log(s, AV_LOG_ERROR, "Unknown codec GUID.\n"); |
return AVERROR_INVALIDDATA; |
} |
avio_skip(pb, 2 + 80); // codec-version + codec-name |
st->codec->bit_rate = avio_rl16(pb); |
|
s->packet_size = avio_rl16(pb); |
avio_skip(pb, 2); // block-size |
st->codec->sample_rate = avio_rl16(pb); |
avio_skip(pb, 2); // sample-size |
|
memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode)); |
nb_rates = avio_rl32(pb); |
nb_rates = FFMIN(nb_rates, 8); |
for (i=0; i<nb_rates; i++) { |
int size = avio_r8(pb); |
int mode = avio_r8(pb); |
if (mode > QCP_MAX_MODE) { |
av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size); |
} else |
c->rates_per_mode[mode] = size; |
} |
avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved |
|
return 0; |
} |
|
static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
AVIOContext *pb = s->pb; |
QCPContext *c = s->priv_data; |
unsigned int chunk_size, tag; |
|
while(!url_feof(pb)) { |
if (c->data_size) { |
int pkt_size, ret, mode = avio_r8(pb); |
|
if (s->packet_size) { |
pkt_size = s->packet_size - 1; |
} else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) { |
c->data_size--; |
continue; |
} |
|
if (c->data_size <= pkt_size) { |
av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n"); |
pkt_size = c->data_size - 1; |
} |
|
if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) { |
if (pkt_size != ret) |
av_log(s, AV_LOG_ERROR, "Packet size is too small.\n"); |
|
c->data_size -= pkt_size + 1; |
} |
return ret; |
} |
|
if (avio_tell(pb) & 1 && avio_r8(pb)) |
av_log(s, AV_LOG_WARNING, "Padding should be 0.\n"); |
|
tag = avio_rl32(pb); |
chunk_size = avio_rl32(pb); |
switch (tag) { |
case MKTAG('v', 'r', 'a', 't'): |
if (avio_rl32(pb)) // var-rate-flag |
s->packet_size = 0; |
avio_skip(pb, 4); // size-in-packets |
break; |
case MKTAG('d', 'a', 't', 'a'): |
c->data_size = chunk_size; |
break; |
|
default: |
avio_skip(pb, chunk_size); |
} |
} |
return AVERROR_EOF; |
} |
|
AVInputFormat ff_qcp_demuxer = { |
.name = "qcp", |
.long_name = NULL_IF_CONFIG_SMALL("QCP"), |
.priv_data_size = sizeof(QCPContext), |
.read_probe = qcp_probe, |
.read_header = qcp_read_header, |
.read_packet = qcp_read_packet, |
}; |