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ffmpeg / libavformat / qcp.c @ e356fc57

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1 cdce0fb8 Kenan Gillet
/*
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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
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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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    AVIOContext *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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    avio_rb32(pb);                    // "RIFF"
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    s->file_size = avio_rl32(pb) + 8;
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    avio_seek(pb, 8 + 4 + 1 + 1, SEEK_CUR);    // "QLCMfmt " + chunk-size + major-version + minor-version
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    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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    st->codec->channels   = 1;
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    avio_read(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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    avio_seek(pb, 2 + 80, SEEK_CUR); // codec-version + codec-name
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    st->codec->bit_rate = avio_rl16(pb);
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    s->packet_size = avio_rl16(pb);
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    avio_seek(pb, 2, SEEK_CUR); // block-size
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    st->codec->sample_rate = avio_rl16(pb);
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    avio_seek(pb, 2, SEEK_CUR); // sample-size
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    memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
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    nb_rates = avio_rl32(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 = avio_r8(pb);
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        int mode = avio_r8(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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    avio_seek(pb, 16 - 2*nb_rates + 20, SEEK_CUR); // 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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    AVIOContext *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 = avio_r8(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 && avio_r8(pb))
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            av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
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        tag        = avio_rl32(pb);
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        chunk_size = avio_rl32(pb);
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        switch (tag) {
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        case MKTAG('v', 'r', 'a', 't'):
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            if (avio_rl32(pb)) // var-rate-flag
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                s->packet_size = 0;
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            avio_seek(pb, 4, SEEK_CUR); // 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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            avio_seek(pb, chunk_size, SEEK_CUR);
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        }
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    }
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    return AVERROR_EOF;
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}
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AVInputFormat ff_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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};