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by Sérgio Benjamim
FFmpeg 2.7.1 source for ppsspp. |
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/*
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* RIFF demuxing functions and data
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* Copyright (c) 2000 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 "libavutil/dict.h" |
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#include "libavutil/error.h" |
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#include "libavutil/log.h" |
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#include "libavutil/mathematics.h" |
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#include "libavcodec/avcodec.h" |
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#include "libavcodec/bytestream.h" |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "riff.h" |
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int ff_get_guid(AVIOContext *s, ff_asf_guid *g) |
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{
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av_assert0(sizeof(*g) == 16); //compiler will optimize this out |
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if (avio_read(s, *g, sizeof(*g)) < (int)sizeof(*g)) { |
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memset(*g, 0, sizeof(*g)); |
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return AVERROR_INVALIDDATA; |
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}
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return 0; |
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}
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enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid) |
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{
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int i; |
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for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++) |
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if (!ff_guidcmp(guids[i].guid, guid)) |
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return guids[i].id; |
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return AV_CODEC_ID_NONE; |
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}
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/* We could be given one of the three possible structures here:
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* WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
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* is an expansion of the previous one with the fields added
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* at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
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* WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
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* an openended structure.
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*/
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static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c) |
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{
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ff_asf_guid subformat; |
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int bps = avio_rl16(pb); |
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if (bps) |
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c->bits_per_coded_sample = bps; |
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c->channel_layout = avio_rl32(pb); /* dwChannelMask */ |
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ff_get_guid(pb, &subformat); |
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if (!memcmp(subformat + 4, |
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(const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) { |
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c->codec_tag = AV_RL32(subformat); |
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c->codec_id = ff_wav_codec_get_id(c->codec_tag, |
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c->bits_per_coded_sample); |
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} else { |
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c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat); |
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if (!c->codec_id) |
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av_log(c, AV_LOG_WARNING, |
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"unknown subformat:"FF_PRI_GUID"\n", |
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FF_ARG_GUID(subformat)); |
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}
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}
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/* "big_endian" values are needed for RIFX file format */
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int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size, int big_endian) |
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{
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int id; |
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if (size < 14) |
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avpriv_request_sample(codec, "wav header size < 14"); |
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codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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if (!big_endian) { |
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id = avio_rl16(pb); |
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codec->channels = avio_rl16(pb); |
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codec->sample_rate = avio_rl32(pb); |
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codec->bit_rate = avio_rl32(pb) * 8; |
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codec->block_align = avio_rl16(pb); |
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} else { |
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id = avio_rb16(pb); |
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codec->channels = avio_rb16(pb); |
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codec->sample_rate = avio_rb32(pb); |
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codec->bit_rate = avio_rb32(pb) * 8; |
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codec->block_align = avio_rb16(pb); |
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}
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if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */ |
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codec->bits_per_coded_sample = 8; |
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} else { |
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if (!big_endian) { |
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codec->bits_per_coded_sample = avio_rl16(pb); |
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} else { |
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codec->bits_per_coded_sample = avio_rb16(pb); |
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}
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}
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if (id == 0xFFFE) { |
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codec->codec_tag = 0; |
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} else { |
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codec->codec_tag = id; |
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codec->codec_id = ff_wav_codec_get_id(id, |
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codec->bits_per_coded_sample); |
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}
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if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */ |
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int cbSize = avio_rl16(pb); /* cbSize */ |
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if (big_endian) { |
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avpriv_report_missing_feature(codec, "WAVEFORMATEX support for RIFX files\n"); |
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return AVERROR_PATCHWELCOME; |
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}
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size -= 18; |
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cbSize = FFMIN(size, cbSize); |
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if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */ |
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parse_waveformatex(pb, codec); |
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cbSize -= 22; |
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size -= 22; |
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}
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if (cbSize > 0) { |
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av_freep(&codec->extradata); |
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if (ff_get_extradata(codec, pb, cbSize) < 0) |
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return AVERROR(ENOMEM); |
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size -= cbSize; |
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}
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/* It is possible for the chunk to contain garbage at the end */
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if (size > 0) |
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avio_skip(pb, size); |
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}
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if (codec->sample_rate <= 0) { |
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av_log(NULL, AV_LOG_ERROR, |
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"Invalid sample rate: %d\n", codec->sample_rate); |
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return AVERROR_INVALIDDATA; |
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}
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if (codec->codec_id == AV_CODEC_ID_AAC_LATM) { |
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/* Channels and sample_rate values are those prior to applying SBR
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* and/or PS. */
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codec->channels = 0; |
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codec->sample_rate = 0; |
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}
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/* override bits_per_coded_sample for G.726 */
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if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate) |
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codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate; |
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return 0; |
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}
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enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps) |
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{
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enum AVCodecID id; |
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id = ff_codec_get_id(ff_codec_wav_tags, tag); |
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if (id <= 0) |
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return id; |
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if (id == AV_CODEC_ID_PCM_S16LE) |
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id = ff_get_pcm_codec_id(bps, 0, 0, ~1); |
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else if (id == AV_CODEC_ID_PCM_F32LE) |
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id = ff_get_pcm_codec_id(bps, 1, 0, 0); |
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if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8) |
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id = AV_CODEC_ID_PCM_ZORK; |
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return id; |
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}
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int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize) |
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{
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int tag1; |
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if(esize) *esize = avio_rl32(pb); |
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else avio_rl32(pb); |
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st->codec->width = avio_rl32(pb); |
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st->codec->height = (int32_t)avio_rl32(pb); |
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avio_rl16(pb); /* planes */ |
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st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */ |
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tag1 = avio_rl32(pb); |
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avio_rl32(pb); /* ImageSize */ |
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avio_rl32(pb); /* XPelsPerMeter */ |
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avio_rl32(pb); /* YPelsPerMeter */ |
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avio_rl32(pb); /* ClrUsed */ |
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avio_rl32(pb); /* ClrImportant */ |
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return tag1; |
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}
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int ff_read_riff_info(AVFormatContext *s, int64_t size) |
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{
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int64_t start, end, cur; |
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AVIOContext *pb = s->pb; |
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start = avio_tell(pb); |
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end = start + size; |
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while ((cur = avio_tell(pb)) >= 0 && |
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cur <= end - 8 /* = tag + size */) { |
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uint32_t chunk_code; |
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int64_t chunk_size; |
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char key[5] = { 0 }; |
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char *value; |
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chunk_code = avio_rl32(pb); |
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chunk_size = avio_rl32(pb); |
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if (avio_feof(pb)) { |
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if (chunk_code || chunk_size) { |
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av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n"); |
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return AVERROR_INVALIDDATA; |
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}
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return AVERROR_EOF; |
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}
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if (chunk_size > end || |
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end - chunk_size < cur || |
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chunk_size == UINT_MAX) { |
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avio_seek(pb, -9, SEEK_CUR); |
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chunk_code = avio_rl32(pb); |
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chunk_size = avio_rl32(pb); |
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if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) { |
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av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n"); |
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return AVERROR_INVALIDDATA; |
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}
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}
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chunk_size += (chunk_size & 1); |
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if (!chunk_code) { |
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if (chunk_size) |
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avio_skip(pb, chunk_size); |
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else if (pb->eof_reached) { |
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av_log(s, AV_LOG_WARNING, "truncated file\n"); |
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return AVERROR_EOF; |
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}
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continue; |
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}
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value = av_mallocz(chunk_size + 1); |
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if (!value) { |
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av_log(s, AV_LOG_ERROR, |
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"out of memory, unable to read INFO tag\n"); |
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return AVERROR(ENOMEM); |
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}
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AV_WL32(key, chunk_code); |
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if (avio_read(pb, value, chunk_size) != chunk_size) { |
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av_log(s, AV_LOG_WARNING, |
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"premature end of file while reading INFO tag\n"); |
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}
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av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); |
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}
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return 0; |
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}
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