303 lines
8.4 KiB
C
303 lines
8.4 KiB
C
/*
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* amr file format
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* Copyright (c) 2001 FFmpeg project
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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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Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
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Only mono files are supported.
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*/
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#include "libavutil/channel_layout.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct {
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uint64_t cumulated_size;
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uint64_t block_count;
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} AMRContext;
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static const char AMR_header[] = "#!AMR\n";
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static const char AMRWB_header[] = "#!AMR-WB\n";
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static const uint8_t amrnb_packed_size[16] = {
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13, 14, 16, 18, 20, 21, 27, 32, 6, 1, 1, 1, 1, 1, 1, 1
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};
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static const uint8_t amrwb_packed_size[16] = {
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18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 1, 1, 1, 1, 1, 1
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};
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#if CONFIG_AMR_MUXER
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static int amr_write_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVCodecParameters *par = s->streams[0]->codecpar;
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s->priv_data = NULL;
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if (par->codec_id == AV_CODEC_ID_AMR_NB) {
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avio_write(pb, AMR_header, sizeof(AMR_header) - 1); /* magic number */
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} else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
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avio_write(pb, AMRWB_header, sizeof(AMRWB_header) - 1); /* magic number */
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} else {
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return -1;
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}
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avio_flush(pb);
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return 0;
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}
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static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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avio_write(s->pb, pkt->data, pkt->size);
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return 0;
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}
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#endif /* CONFIG_AMR_MUXER */
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static int amr_probe(AVProbeData *p)
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{
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// Only check for "#!AMR" which could be amr-wb, amr-nb.
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// This will also trigger multichannel files: "#!AMR_MC1.0\n" and
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// "#!AMR-WB_MC1.0\n" (not supported)
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if (!memcmp(p->buf, AMR_header, 5))
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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/* amr input */
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static int amr_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVStream *st;
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uint8_t header[9];
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avio_read(pb, header, 6);
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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if (memcmp(header, AMR_header, 6)) {
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avio_read(pb, header + 6, 3);
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if (memcmp(header, AMRWB_header, 9)) {
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return -1;
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}
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st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
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st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
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st->codecpar->sample_rate = 16000;
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} else {
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st->codecpar->codec_tag = MKTAG('s', 'a', 'm', 'r');
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st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
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st->codecpar->sample_rate = 8000;
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}
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st->codecpar->channels = 1;
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st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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return 0;
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}
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static int amr_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVCodecParameters *par = s->streams[0]->codecpar;
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int read, size = 0, toc, mode;
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int64_t pos = avio_tell(s->pb);
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AMRContext *amr = s->priv_data;
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if (avio_feof(s->pb)) {
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return AVERROR_EOF;
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}
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// FIXME this is wrong, this should rather be in an AVParser
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toc = avio_r8(s->pb);
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mode = (toc >> 3) & 0x0F;
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if (par->codec_id == AV_CODEC_ID_AMR_NB) {
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size = amrnb_packed_size[mode];
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} else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
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size = amrwb_packed_size[mode];
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}
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if (!size || av_new_packet(pkt, size))
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return AVERROR(EIO);
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if (amr->cumulated_size < UINT64_MAX - size) {
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amr->cumulated_size += size;
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/* Both AMR formats have 50 frames per second */
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s->streams[0]->codecpar->bit_rate = amr->cumulated_size / ++amr->block_count * 8 * 50;
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}
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pkt->stream_index = 0;
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pkt->pos = pos;
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pkt->data[0] = toc;
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pkt->duration = par->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320;
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read = avio_read(s->pb, pkt->data + 1, size - 1);
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if (read != size - 1) {
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av_packet_unref(pkt);
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if (read < 0)
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return read;
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return AVERROR(EIO);
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}
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return 0;
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}
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#if CONFIG_AMR_DEMUXER
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AVInputFormat ff_amr_demuxer = {
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.name = "amr",
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.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
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.priv_data_size = sizeof(AMRContext),
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.read_probe = amr_probe,
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.read_header = amr_read_header,
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.read_packet = amr_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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};
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#endif
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#if CONFIG_AMRNB_DEMUXER
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static int amrnb_probe(AVProbeData *p)
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{
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int mode, i = 0, valid = 0, invalid = 0;
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const uint8_t *b = p->buf;
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while (i < p->buf_size) {
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mode = b[i] >> 3 & 0x0F;
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if (mode < 9 && (b[i] & 0x4) == 0x4) {
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int last = b[i];
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int size = amrnb_packed_size[mode];
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while (size--) {
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if (b[++i] != last)
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break;
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}
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if (size > 0) {
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valid++;
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i += size;
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}
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} else {
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valid = 0;
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invalid++;
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i++;
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}
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}
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if (valid > 100 && valid >> 4 > invalid)
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return AVPROBE_SCORE_EXTENSION / 2 + 1;
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return 0;
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}
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static int amrnb_read_header(AVFormatContext *s)
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{
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
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st->codecpar->sample_rate = 8000;
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st->codecpar->channels = 1;
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st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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avpriv_set_pts_info(st, 64, 1, 8000);
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return 0;
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}
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AVInputFormat ff_amrnb_demuxer = {
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.name = "amrnb",
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.long_name = NULL_IF_CONFIG_SMALL("raw AMR-NB"),
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.priv_data_size = sizeof(AMRContext),
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.read_probe = amrnb_probe,
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.read_header = amrnb_read_header,
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.read_packet = amr_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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};
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#endif
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#if CONFIG_AMRWB_DEMUXER
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static int amrwb_probe(AVProbeData *p)
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{
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int mode, i = 0, valid = 0, invalid = 0;
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const uint8_t *b = p->buf;
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while (i < p->buf_size) {
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mode = b[i] >> 3 & 0x0F;
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if (mode < 10 && (b[i] & 0x4) == 0x4) {
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int last = b[i];
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int size = amrwb_packed_size[mode];
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while (size--) {
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if (b[++i] != last)
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break;
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}
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if (size > 0) {
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valid++;
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i += size;
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}
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} else {
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valid = 0;
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invalid++;
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i++;
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}
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}
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if (valid > 100 && valid >> 4 > invalid)
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return AVPROBE_SCORE_EXTENSION / 2 + 1;
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return 0;
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}
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static int amrwb_read_header(AVFormatContext *s)
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{
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
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st->codecpar->sample_rate = 16000;
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st->codecpar->channels = 1;
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st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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avpriv_set_pts_info(st, 64, 1, 16000);
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return 0;
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}
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AVInputFormat ff_amrwb_demuxer = {
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.name = "amrwb",
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.long_name = NULL_IF_CONFIG_SMALL("raw AMR-WB"),
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.priv_data_size = sizeof(AMRContext),
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.read_probe = amrwb_probe,
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.read_header = amrwb_read_header,
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.read_packet = amr_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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};
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#endif
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#if CONFIG_AMR_MUXER
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AVOutputFormat ff_amr_muxer = {
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.name = "amr",
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.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
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.mime_type = "audio/amr",
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.extensions = "amr",
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.audio_codec = AV_CODEC_ID_AMR_NB,
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.video_codec = AV_CODEC_ID_NONE,
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.write_header = amr_write_header,
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.write_packet = amr_write_packet,
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.flags = AVFMT_NOTIMESTAMPS,
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};
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#endif
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