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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.  
  34. typedef struct {
  35.     uint32_t data_size;                     ///< size of data chunk
  36.  
  37. #define QCP_MAX_MODE 4
  38.     int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
  39.                                             ///< to each mode, -1 if no size.
  40. } QCPContext;
  41.  
  42. /**
  43.  * Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file;
  44.  * the first byte of the GUID can be either 0x41 or 0x42.
  45.  */
  46. static const uint8_t guid_qcelp_13k_part[15] = {
  47.     0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba,
  48.     0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e
  49. };
  50.  
  51. /**
  52.  * EVRC GUID as stored in the file
  53.  */
  54. static const uint8_t guid_evrc[16] = {
  55.     0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46,
  56.     0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
  57. };
  58.  
  59. /**
  60.  * SMV GUID as stored in the file
  61.  */
  62. static const uint8_t guid_smv[16] = {
  63.     0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
  64.     0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
  65. };
  66.  
  67. /**
  68.  * @param guid contains at least 16 bytes
  69.  * @return 1 if the guid is a qcelp_13k guid, 0 otherwise
  70.  */
  71. static int is_qcelp_13k_guid(const uint8_t *guid) {
  72.     return (guid[0] == 0x41 || guid[0] == 0x42)
  73.         && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
  74. }
  75.  
  76. static int qcp_probe(AVProbeData *pd)
  77. {
  78.     if (AV_RL32(pd->buf  ) == AV_RL32("RIFF") &&
  79.         AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
  80.         return AVPROBE_SCORE_MAX;
  81.     return 0;
  82. }
  83.  
  84. static int qcp_read_header(AVFormatContext *s)
  85. {
  86.     AVIOContext *pb = s->pb;
  87.     QCPContext    *c  = s->priv_data;
  88.     AVStream      *st = avformat_new_stream(s, NULL);
  89.     uint8_t       buf[16];
  90.     int           i, nb_rates;
  91.  
  92.     if (!st)
  93.         return AVERROR(ENOMEM);
  94.  
  95.     avio_rb32(pb);                    // "RIFF"
  96.     avio_skip(pb, 4 + 8 + 4 + 1 + 1);    // filesize + "QLCMfmt " + chunk-size + major-version + minor-version
  97.  
  98.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  99.     st->codec->channels   = 1;
  100.     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
  101.     avio_read(pb, buf, 16);
  102.     if (is_qcelp_13k_guid(buf)) {
  103.         st->codec->codec_id = AV_CODEC_ID_QCELP;
  104.     } else if (!memcmp(buf, guid_evrc, 16)) {
  105.         st->codec->codec_id = AV_CODEC_ID_EVRC;
  106.     } else if (!memcmp(buf, guid_smv, 16)) {
  107.         st->codec->codec_id = AV_CODEC_ID_SMV;
  108.     } else {
  109.         av_log(s, AV_LOG_ERROR, "Unknown codec GUID.\n");
  110.         return AVERROR_INVALIDDATA;
  111.     }
  112.     avio_skip(pb, 2 + 80); // codec-version + codec-name
  113.     st->codec->bit_rate = avio_rl16(pb);
  114.  
  115.     s->packet_size = avio_rl16(pb);
  116.     avio_skip(pb, 2); // block-size
  117.     st->codec->sample_rate = avio_rl16(pb);
  118.     avio_skip(pb, 2); // sample-size
  119.  
  120.     memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
  121.     nb_rates = avio_rl32(pb);
  122.     nb_rates = FFMIN(nb_rates, 8);
  123.     for (i=0; i<nb_rates; i++) {
  124.         int size = avio_r8(pb);
  125.         int mode = avio_r8(pb);
  126.         if (mode > QCP_MAX_MODE) {
  127.             av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size);
  128.         } else
  129.             c->rates_per_mode[mode] = size;
  130.     }
  131.     avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
  132.  
  133.     return 0;
  134. }
  135.  
  136. static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
  137. {
  138.     AVIOContext *pb = s->pb;
  139.     QCPContext    *c  = s->priv_data;
  140.     unsigned int  chunk_size, tag;
  141.  
  142.     while(!url_feof(pb)) {
  143.         if (c->data_size) {
  144.             int pkt_size, ret, mode = avio_r8(pb);
  145.  
  146.             if (s->packet_size) {
  147.                 pkt_size = s->packet_size - 1;
  148.             } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
  149.                 c->data_size--;
  150.                 continue;
  151.             }
  152.  
  153.             if (c->data_size <= pkt_size) {
  154.                 av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n");
  155.                 pkt_size = c->data_size - 1;
  156.             }
  157.  
  158.             if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
  159.                 if (pkt_size != ret)
  160.                     av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");
  161.  
  162.                 c->data_size -= pkt_size + 1;
  163.             }
  164.             return ret;
  165.         }
  166.  
  167.         if (avio_tell(pb) & 1 && avio_r8(pb))
  168.             av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
  169.  
  170.         tag        = avio_rl32(pb);
  171.         chunk_size = avio_rl32(pb);
  172.         switch (tag) {
  173.         case MKTAG('v', 'r', 'a', 't'):
  174.             if (avio_rl32(pb)) // var-rate-flag
  175.                 s->packet_size = 0;
  176.             avio_skip(pb, 4); // size-in-packets
  177.             break;
  178.         case MKTAG('d', 'a', 't', 'a'):
  179.             c->data_size = chunk_size;
  180.             break;
  181.  
  182.         default:
  183.             avio_skip(pb, chunk_size);
  184.         }
  185.     }
  186.     return AVERROR_EOF;
  187. }
  188.  
  189. AVInputFormat ff_qcp_demuxer = {
  190.     .name           = "qcp",
  191.     .long_name      = NULL_IF_CONFIG_SMALL("QCP"),
  192.     .priv_data_size = sizeof(QCPContext),
  193.     .read_probe     = qcp_probe,
  194.     .read_header    = qcp_read_header,
  195.     .read_packet    = qcp_read_packet,
  196. };
  197.