| /* |
| * 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" |
| #include "riff.h" |
| |
| typedef struct QCPContext { |
| 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 |
| }; |
| |
| static const uint8_t guid_4gv[16] = { |
| 0xca, 0x29, 0xfd, 0x3c, 0x53, 0xf6, 0xf5, 0x4e, |
| 0x90, 0xe9, 0xf4, 0x23, 0x6d, 0x59, 0x9b, 0x61 |
| }; |
| |
| /** |
| * 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(const 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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->channels = 1; |
| st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
| avio_read(pb, buf, 16); |
| if (is_qcelp_13k_guid(buf)) { |
| st->codecpar->codec_id = AV_CODEC_ID_QCELP; |
| } else if (!memcmp(buf, guid_evrc, 16)) { |
| st->codecpar->codec_id = AV_CODEC_ID_EVRC; |
| } else if (!memcmp(buf, guid_smv, 16)) { |
| st->codecpar->codec_id = AV_CODEC_ID_SMV; |
| } else if (!memcmp(buf, guid_4gv, 16)) { |
| st->codecpar->codec_id = AV_CODEC_ID_4GV; |
| } else { |
| av_log(s, AV_LOG_ERROR, "Unknown codec GUID "FF_PRI_GUID".\n", |
| FF_ARG_GUID(buf)); |
| return AVERROR_INVALIDDATA; |
| } |
| avio_skip(pb, 2 + 80); // codec-version + codec-name |
| st->codecpar->bit_rate = avio_rl16(pb); |
| |
| s->packet_size = avio_rl16(pb); |
| avio_skip(pb, 2); // block-size |
| st->codecpar->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(!avio_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, |
| }; |