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authorKenan Gillet <kenan.gillet@gmail.com>2009-05-20 17:19:39 +0000
committerKenan Gillet <kenan.gillet@gmail.com>2009-05-20 17:19:39 +0000
commitcdce0fb84518cb3b906dceb3fd3f8610407fbdd4 (patch)
treed3561e26bfbcf68270bd230f8e961109fd8be899 /libavformat/qcp.c
parentde08ebe381b0ade0566990828a3491fecd318b22 (diff)
downloadffmpeg-cdce0fb84518cb3b906dceb3fd3f8610407fbdd4.tar.gz
Add QCP demuxer.
Originally committed as revision 18883 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/qcp.c')
-rw-r--r--libavformat/qcp.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/libavformat/qcp.c b/libavformat/qcp.c
new file mode 100644
index 0000000000..2aadb2d79b
--- /dev/null
+++ b/libavformat/qcp.c
@@ -0,0 +1,197 @@
+/*
+ * 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 libavformat/qcp.c
+ * QCP format (.qcp) demuxer
+ * @author Kenan Gillet
+ * @sa RFC 3625: "The QCP File Format and Media Types for Speech Data"
+ * http://tools.ietf.org/html/rfc3625
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+
+typedef struct {
+ 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
+};
+
+/**
+ * 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(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, AVFormatParameters *ap)
+{
+ ByteIOContext *pb = s->pb;
+ QCPContext *c = s->priv_data;
+ AVStream *st = av_new_stream(s, 0);
+ uint8_t buf[16];
+ int i, nb_rates;
+
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ get_be32(pb); // "RIFF"
+ s->file_size = get_le32(pb) + 8;
+ url_fskip(pb, 8 + 4 + 1 + 1); // "QLCMfmt " + chunk-size + major-version + minor-version
+
+ st->codec->codec_type = CODEC_TYPE_AUDIO;
+ st->codec->channels = 1;
+ get_buffer(pb, buf, 16);
+ if (is_qcelp_13k_guid(buf)) {
+ st->codec->codec_id = CODEC_ID_QCELP;
+ } else if (!memcmp(buf, guid_evrc, 16)) {
+ av_log(s, AV_LOG_ERROR, "EVRC codec is not supported.\n");
+ return AVERROR_PATCHWELCOME;
+ } else if (!memcmp(buf, guid_smv, 16)) {
+ av_log(s, AV_LOG_ERROR, "SMV codec is not supported.\n");
+ return AVERROR_PATCHWELCOME;
+ } else {
+ av_log(s, AV_LOG_ERROR, "Unknown codec GUID.\n");
+ return AVERROR_INVALIDDATA;
+ }
+ url_fskip(pb, 2 + 80); // codec-version + codec-name
+ st->codec->bit_rate = get_le16(pb);
+
+ s->packet_size = get_le16(pb);
+ url_fskip(pb, 2); // block-size
+ st->codec->sample_rate = get_le16(pb);
+ url_fskip(pb, 2); // sample-size
+
+ memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
+ nb_rates = get_le32(pb);
+ nb_rates = FFMIN(nb_rates, 8);
+ for (i=0; i<nb_rates; i++) {
+ int size = get_byte(pb);
+ int mode = get_byte(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;
+ }
+ url_fskip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
+
+ return 0;
+}
+
+static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ ByteIOContext *pb = s->pb;
+ QCPContext *c = s->priv_data;
+ unsigned int chunk_size, tag;
+
+ while(!url_feof(pb)) {
+ if (c->data_size) {
+ int pkt_size, ret, mode = get_byte(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 (url_ftell(pb) & 1 && get_byte(pb))
+ av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
+
+ tag = get_le32(pb);
+ chunk_size = get_le32(pb);
+ switch (tag) {
+ case MKTAG('v', 'r', 'a', 't'):
+ if (get_le32(pb)) // var-rate-flag
+ s->packet_size = 0;
+ url_fskip(pb, 4); // size-in-packets
+ break;
+ case MKTAG('d', 'a', 't', 'a'):
+ c->data_size = chunk_size;
+ break;
+
+ default:
+ url_fskip(pb, chunk_size);
+ }
+ }
+ return AVERROR_EOF;
+}
+
+AVInputFormat qcp_demuxer = {
+ .name = "qcp",
+ .long_name = NULL_IF_CONFIG_SMALL("QCP format"),
+ .priv_data_size = sizeof(QCPContext),
+ .read_probe = qcp_probe,
+ .read_header = qcp_read_header,
+ .read_packet = qcp_read_packet,
+};