mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 24993 to svn://svn.ffmpeg.org/ffmpeg/trunkoldabi
Aurelien Jacobs
15 years ago
parent
79ce0f002e
commit
e94204dfd8
15 changed files with 251 additions and 121 deletions
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/*
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* PCM common functions |
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* Copyright (c) 2003 Fabrice Bellard |
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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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#include "avformat.h" |
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#include "pcm.h" |
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int pcm_read_seek(AVFormatContext *s, |
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int stream_index, int64_t timestamp, int flags) |
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{ |
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AVStream *st; |
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int block_align, byte_rate; |
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int64_t pos, ret; |
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st = s->streams[0]; |
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block_align = st->codec->block_align ? st->codec->block_align : |
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(av_get_bits_per_sample(st->codec->codec_id) * st->codec->channels) >> 3; |
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byte_rate = st->codec->bit_rate ? st->codec->bit_rate >> 3 : |
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block_align * st->codec->sample_rate; |
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if (block_align <= 0 || byte_rate <= 0) |
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return -1; |
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if (timestamp < 0) timestamp = 0; |
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/* compute the position by aligning it to block_align */ |
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pos = av_rescale_rnd(timestamp * byte_rate, |
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st->time_base.num, |
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st->time_base.den * (int64_t)block_align, |
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(flags & AVSEEK_FLAG_BACKWARD) ? AV_ROUND_DOWN : AV_ROUND_UP); |
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pos *= block_align; |
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/* recompute exact position */ |
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st->cur_dts = av_rescale(pos, st->time_base.den, byte_rate * (int64_t)st->time_base.num); |
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if ((ret = url_fseek(s->pb, pos + s->data_offset, SEEK_SET)) < 0) |
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return ret; |
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return 0; |
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} |
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/*
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* PCM common functions |
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* Copyright (C) 2007 Aurelien Jacobs <aurel@gnuage.org> |
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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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#ifndef AVFORMAT_PCM_H |
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#define AVFORMAT_PCM_H |
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#include "avformat.h" |
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int pcm_read_seek(AVFormatContext *s, |
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int stream_index, int64_t timestamp, int flags); |
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#endif /* AVFORMAT_PCM_H */ |
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/*
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* RAW PCM demuxers |
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* Copyright (c) 2002 Fabrice Bellard |
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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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#include "avformat.h" |
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#include "raw.h" |
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#include "pcm.h" |
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#define RAW_SAMPLES 1024 |
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static int raw_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int ret, size, bps; |
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// AVStream *st = s->streams[0];
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size= RAW_SAMPLES*s->streams[0]->codec->block_align; |
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ret= av_get_packet(s->pb, pkt, size); |
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pkt->stream_index = 0; |
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if (ret < 0) |
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return ret; |
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bps= av_get_bits_per_sample(s->streams[0]->codec->codec_id); |
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assert(bps); // if false there IS a bug elsewhere (NOT in this function)
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pkt->dts= |
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pkt->pts= pkt->pos*8 / (bps * s->streams[0]->codec->channels); |
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return ret; |
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} |
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#define PCMDEF(name, long_name, ext, codec) \ |
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AVInputFormat pcm_ ## name ## _demuxer = {\
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#name,\ |
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NULL_IF_CONFIG_SMALL(long_name),\
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0,\
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NULL,\
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ff_raw_read_header,\
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raw_read_packet,\
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NULL,\
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pcm_read_seek,\
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.flags= AVFMT_GENERIC_INDEX,\
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.extensions = ext,\
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.value = codec,\
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}; |
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PCMDEF(f64be, "PCM 64 bit floating-point big-endian format", |
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NULL, CODEC_ID_PCM_F64BE) |
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PCMDEF(f64le, "PCM 64 bit floating-point little-endian format", |
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NULL, CODEC_ID_PCM_F64LE) |
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PCMDEF(f32be, "PCM 32 bit floating-point big-endian format", |
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NULL, CODEC_ID_PCM_F32BE) |
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PCMDEF(f32le, "PCM 32 bit floating-point little-endian format", |
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NULL, CODEC_ID_PCM_F32LE) |
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PCMDEF(s32be, "PCM signed 32 bit big-endian format", |
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NULL, CODEC_ID_PCM_S32BE) |
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PCMDEF(s32le, "PCM signed 32 bit little-endian format", |
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NULL, CODEC_ID_PCM_S32LE) |
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PCMDEF(s24be, "PCM signed 24 bit big-endian format", |
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NULL, CODEC_ID_PCM_S24BE) |
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PCMDEF(s24le, "PCM signed 24 bit little-endian format", |
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NULL, CODEC_ID_PCM_S24LE) |
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PCMDEF(s16be, "PCM signed 16 bit big-endian format", |
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AV_NE("sw", NULL), CODEC_ID_PCM_S16BE) |
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PCMDEF(s16le, "PCM signed 16 bit little-endian format", |
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AV_NE(NULL, "sw"), CODEC_ID_PCM_S16LE) |
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PCMDEF(s8, "PCM signed 8 bit format", |
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"sb", CODEC_ID_PCM_S8) |
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PCMDEF(u32be, "PCM unsigned 32 bit big-endian format", |
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NULL, CODEC_ID_PCM_U32BE) |
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PCMDEF(u32le, "PCM unsigned 32 bit little-endian format", |
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NULL, CODEC_ID_PCM_U32LE) |
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PCMDEF(u24be, "PCM unsigned 24 bit big-endian format", |
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NULL, CODEC_ID_PCM_U24BE) |
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PCMDEF(u24le, "PCM unsigned 24 bit little-endian format", |
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NULL, CODEC_ID_PCM_U24LE) |
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PCMDEF(u16be, "PCM unsigned 16 bit big-endian format", |
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AV_NE("uw", NULL), CODEC_ID_PCM_U16BE) |
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PCMDEF(u16le, "PCM unsigned 16 bit little-endian format", |
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AV_NE(NULL, "uw"), CODEC_ID_PCM_U16LE) |
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PCMDEF(u8, "PCM unsigned 8 bit format", |
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"ub", CODEC_ID_PCM_U8) |
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PCMDEF(alaw, "PCM A-law format", |
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"al", CODEC_ID_PCM_ALAW) |
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PCMDEF(mulaw, "PCM mu-law format", |
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"ul", CODEC_ID_PCM_MULAW) |
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