Add QCP demuxer.

Originally committed as revision 18883 to svn://svn.ffmpeg.org/ffmpeg/trunk

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,
+};