mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 18883 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
Kenan Gillet
16 years ago
parent
de08ebe381
commit
cdce0fb845
6 changed files with 202 additions and 1 deletions
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/*
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* QCP format (.qcp) demuxer |
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* Copyright (c) 2009 Kenan Gillet |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file libavformat/qcp.c |
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* QCP format (.qcp) demuxer |
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* @author Kenan Gillet |
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* @sa RFC 3625: "The QCP File Format and Media Types for Speech Data" |
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* http://tools.ietf.org/html/rfc3625
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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typedef struct { |
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uint32_t data_size; ///< size of data chunk
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#define QCP_MAX_MODE 4 |
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int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
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///< to each mode, -1 if no size.
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} QCPContext; |
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/**
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* Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file; |
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* the first byte of the GUID can be either 0x41 or 0x42. |
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*/ |
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static const uint8_t guid_qcelp_13k_part[15] = { |
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0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba, |
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0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e |
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}; |
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/**
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* EVRC GUID as stored in the file |
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*/ |
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static const uint8_t guid_evrc[16] = { |
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0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46, |
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0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4 |
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}; |
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/**
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* SMV GUID as stored in the file |
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*/ |
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static const uint8_t guid_smv[16] = { |
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0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed, |
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0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84 |
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}; |
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/**
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* @param guid contains at least 16 bytes |
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* @return 1 if the guid is a qcelp_13k guid, 0 otherwise |
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*/ |
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static int is_qcelp_13k_guid(const uint8_t *guid) { |
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return (guid[0] == 0x41 || guid[0] == 0x42) |
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&& !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part)); |
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} |
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static int qcp_probe(AVProbeData *pd) |
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{ |
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if (AV_RL32(pd->buf ) == AV_RL32("RIFF") && |
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AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt ")) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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static int qcp_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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ByteIOContext *pb = s->pb; |
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QCPContext *c = s->priv_data; |
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AVStream *st = av_new_stream(s, 0); |
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uint8_t buf[16]; |
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int i, nb_rates; |
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if (!st) |
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return AVERROR(ENOMEM); |
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get_be32(pb); // "RIFF"
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s->file_size = get_le32(pb) + 8; |
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url_fskip(pb, 8 + 4 + 1 + 1); // "QLCMfmt " + chunk-size + major-version + minor-version
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st->codec->codec_type = CODEC_TYPE_AUDIO; |
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st->codec->channels = 1; |
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get_buffer(pb, buf, 16); |
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if (is_qcelp_13k_guid(buf)) { |
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st->codec->codec_id = CODEC_ID_QCELP; |
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} else if (!memcmp(buf, guid_evrc, 16)) { |
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av_log(s, AV_LOG_ERROR, "EVRC codec is not supported.\n"); |
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return AVERROR_PATCHWELCOME; |
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} else if (!memcmp(buf, guid_smv, 16)) { |
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av_log(s, AV_LOG_ERROR, "SMV codec is not supported.\n"); |
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return AVERROR_PATCHWELCOME; |
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} else { |
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av_log(s, AV_LOG_ERROR, "Unknown codec GUID.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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url_fskip(pb, 2 + 80); // codec-version + codec-name
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st->codec->bit_rate = get_le16(pb); |
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s->packet_size = get_le16(pb); |
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url_fskip(pb, 2); // block-size
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st->codec->sample_rate = get_le16(pb); |
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url_fskip(pb, 2); // sample-size
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memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode)); |
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nb_rates = get_le32(pb); |
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nb_rates = FFMIN(nb_rates, 8); |
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for (i=0; i<nb_rates; i++) { |
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int size = get_byte(pb); |
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int mode = get_byte(pb); |
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if (mode > QCP_MAX_MODE) { |
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av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size); |
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} else |
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c->rates_per_mode[mode] = size; |
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} |
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url_fskip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
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return 0; |
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} |
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static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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ByteIOContext *pb = s->pb; |
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QCPContext *c = s->priv_data; |
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unsigned int chunk_size, tag; |
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while(!url_feof(pb)) { |
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if (c->data_size) { |
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int pkt_size, ret, mode = get_byte(pb); |
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if (s->packet_size) { |
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pkt_size = s->packet_size - 1; |
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} else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) { |
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c->data_size--; |
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continue; |
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} |
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if (c->data_size <= pkt_size) { |
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av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n"); |
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pkt_size = c->data_size - 1; |
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} |
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if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) { |
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if (pkt_size != ret) |
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av_log(s, AV_LOG_ERROR, "Packet size is too small.\n"); |
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c->data_size -= pkt_size + 1; |
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} |
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return ret; |
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} |
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if (url_ftell(pb) & 1 && get_byte(pb)) |
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av_log(s, AV_LOG_WARNING, "Padding should be 0.\n"); |
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tag = get_le32(pb); |
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chunk_size = get_le32(pb); |
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switch (tag) { |
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case MKTAG('v', 'r', 'a', 't'): |
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if (get_le32(pb)) // var-rate-flag
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s->packet_size = 0; |
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url_fskip(pb, 4); // size-in-packets
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break; |
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case MKTAG('d', 'a', 't', 'a'): |
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c->data_size = chunk_size; |
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break; |
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default: |
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url_fskip(pb, chunk_size); |
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} |
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} |
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return AVERROR_EOF; |
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} |
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AVInputFormat qcp_demuxer = { |
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.name = "qcp", |
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.long_name = NULL_IF_CONFIG_SMALL("QCP format"), |
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.priv_data_size = sizeof(QCPContext), |
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.read_probe = qcp_probe, |
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.read_header = qcp_read_header, |
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.read_packet = qcp_read_packet, |
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}; |
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