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  1. /*
  2.  * QCP format (.qcp) demuxer
  3.  * Copyright (c) 2009 Kenan Gillet
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * QCP format (.qcp) demuxer
  25.  * @author Kenan Gillet
  26.  * @see RFC 3625: "The QCP File Format and Media Types for Speech Data"
  27.  *     http://tools.ietf.org/html/rfc3625
  28.  */
  29.  
  30. #include "libavutil/channel_layout.h"
  31. #include "libavutil/intreadwrite.h"
  32. #include "avformat.h"
  33. #include "riff.h"
  34.  
  35. typedef struct QCPContext {
  36.     uint32_t data_size;                     ///< size of data chunk
  37.  
  38. #define QCP_MAX_MODE 4
  39.     int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
  40.                                             ///< to each mode, -1 if no size.
  41. } QCPContext;
  42.  
  43. /**
  44.  * Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file;
  45.  * the first byte of the GUID can be either 0x41 or 0x42.
  46.  */
  47. static const uint8_t guid_qcelp_13k_part[15] = {
  48.     0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba,
  49.     0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e
  50. };
  51.  
  52. /**
  53.  * EVRC GUID as stored in the file
  54.  */
  55. static const uint8_t guid_evrc[16] = {
  56.     0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46,
  57.     0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
  58. };
  59.  
  60. static const uint8_t guid_4gv[16] = {
  61.     0xca, 0x29, 0xfd, 0x3c, 0x53, 0xf6, 0xf5, 0x4e,
  62.     0x90, 0xe9, 0xf4, 0x23, 0x6d, 0x59, 0x9b, 0x61
  63. };
  64.  
  65. /**
  66.  * SMV GUID as stored in the file
  67.  */
  68. static const uint8_t guid_smv[16] = {
  69.     0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
  70.     0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
  71. };
  72.  
  73. /**
  74.  * @param guid contains at least 16 bytes
  75.  * @return 1 if the guid is a qcelp_13k guid, 0 otherwise
  76.  */
  77. static int is_qcelp_13k_guid(const uint8_t *guid) {
  78.     return (guid[0] == 0x41 || guid[0] == 0x42)
  79.         && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
  80. }
  81.  
  82. static int qcp_probe(AVProbeData *pd)
  83. {
  84.     if (AV_RL32(pd->buf  ) == AV_RL32("RIFF") &&
  85.         AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
  86.         return AVPROBE_SCORE_MAX;
  87.     return 0;
  88. }
  89.  
  90. static int qcp_read_header(AVFormatContext *s)
  91. {
  92.     AVIOContext *pb = s->pb;
  93.     QCPContext    *c  = s->priv_data;
  94.     AVStream      *st = avformat_new_stream(s, NULL);
  95.     uint8_t       buf[16];
  96.     int           i, nb_rates;
  97.  
  98.     if (!st)
  99.         return AVERROR(ENOMEM);
  100.  
  101.     avio_rb32(pb);                    // "RIFF"
  102.     avio_skip(pb, 4 + 8 + 4 + 1 + 1);    // filesize + "QLCMfmt " + chunk-size + major-version + minor-version
  103.  
  104.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  105.     st->codec->channels   = 1;
  106.     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
  107.     avio_read(pb, buf, 16);
  108.     if (is_qcelp_13k_guid(buf)) {
  109.         st->codec->codec_id = AV_CODEC_ID_QCELP;
  110.     } else if (!memcmp(buf, guid_evrc, 16)) {
  111.         st->codec->codec_id = AV_CODEC_ID_EVRC;
  112.     } else if (!memcmp(buf, guid_smv, 16)) {
  113.         st->codec->codec_id = AV_CODEC_ID_SMV;
  114.     } else if (!memcmp(buf, guid_4gv, 16)) {
  115.         st->codec->codec_id = AV_CODEC_ID_4GV;
  116.     } else {
  117.         av_log(s, AV_LOG_ERROR, "Unknown codec GUID "FF_PRI_GUID".\n",
  118.                FF_ARG_GUID(buf));
  119.         return AVERROR_INVALIDDATA;
  120.     }
  121.     avio_skip(pb, 2 + 80); // codec-version + codec-name
  122.     st->codec->bit_rate = avio_rl16(pb);
  123.  
  124.     s->packet_size = avio_rl16(pb);
  125.     avio_skip(pb, 2); // block-size
  126.     st->codec->sample_rate = avio_rl16(pb);
  127.     avio_skip(pb, 2); // sample-size
  128.  
  129.     memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
  130.     nb_rates = avio_rl32(pb);
  131.     nb_rates = FFMIN(nb_rates, 8);
  132.     for (i=0; i<nb_rates; i++) {
  133.         int size = avio_r8(pb);
  134.         int mode = avio_r8(pb);
  135.         if (mode > QCP_MAX_MODE) {
  136.             av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size);
  137.         } else
  138.             c->rates_per_mode[mode] = size;
  139.     }
  140.     avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
  141.  
  142.     return 0;
  143. }
  144.  
  145. static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
  146. {
  147.     AVIOContext *pb = s->pb;
  148.     QCPContext    *c  = s->priv_data;
  149.     unsigned int  chunk_size, tag;
  150.  
  151.     while(!avio_feof(pb)) {
  152.         if (c->data_size) {
  153.             int pkt_size, ret, mode = avio_r8(pb);
  154.  
  155.             if (s->packet_size) {
  156.                 pkt_size = s->packet_size - 1;
  157.             } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
  158.                 c->data_size--;
  159.                 continue;
  160.             }
  161.  
  162.             if (c->data_size <= pkt_size) {
  163.                 av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n");
  164.                 pkt_size = c->data_size - 1;
  165.             }
  166.  
  167.             if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
  168.                 if (pkt_size != ret)
  169.                     av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");
  170.  
  171.                 c->data_size -= pkt_size + 1;
  172.             }
  173.             return ret;
  174.         }
  175.  
  176.         if (avio_tell(pb) & 1 && avio_r8(pb))
  177.             av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
  178.  
  179.         tag        = avio_rl32(pb);
  180.         chunk_size = avio_rl32(pb);
  181.         switch (tag) {
  182.         case MKTAG('v', 'r', 'a', 't'):
  183.             if (avio_rl32(pb)) // var-rate-flag
  184.                 s->packet_size = 0;
  185.             avio_skip(pb, 4); // size-in-packets
  186.             break;
  187.         case MKTAG('d', 'a', 't', 'a'):
  188.             c->data_size = chunk_size;
  189.             break;
  190.  
  191.         default:
  192.             avio_skip(pb, chunk_size);
  193.         }
  194.     }
  195.     return AVERROR_EOF;
  196. }
  197.  
  198. AVInputFormat ff_qcp_demuxer = {
  199.     .name           = "qcp",
  200.     .long_name      = NULL_IF_CONFIG_SMALL("QCP"),
  201.     .priv_data_size = sizeof(QCPContext),
  202.     .read_probe     = qcp_probe,
  203.     .read_header    = qcp_read_header,
  204.     .read_packet    = qcp_read_packet,
  205. };
  206.