diff options
author | Justin Ruggles <justin.ruggles@gmail.com> | 2012-01-20 13:56:51 -0500 |
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committer | Justin Ruggles <justin.ruggles@gmail.com> | 2012-01-23 10:34:48 -0500 |
commit | e924a4ba715da13260ed83262469a8a56aad427b (patch) | |
tree | d2f2aa8df338d7ba1072d19588d96ddf7f804147 /libavformat/westwood.c | |
parent | 15cea3695daf3f6363794594982e3816ddc8d90b (diff) |
westwood: split the AUD and VQA demuxers into separate files.
They have no code in common.
Diffstat (limited to 'libavformat/westwood.c')
-rw-r--r-- | libavformat/westwood.c | 394 |
1 files changed, 0 insertions, 394 deletions
diff --git a/libavformat/westwood.c b/libavformat/westwood.c deleted file mode 100644 index 82b7e94840..0000000000 --- a/libavformat/westwood.c +++ /dev/null @@ -1,394 +0,0 @@ -/* - * Westwood Studios Multimedia Formats Demuxer (VQA, AUD) - * Copyright (c) 2003 The ffmpeg Project - * - * This file is part of Libav. - * - * Libav 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. - * - * Libav 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 Libav; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * Westwood Studios VQA & AUD file demuxers - * by Mike Melanson (melanson@pcisys.net) - * for more information on the Westwood file formats, visit: - * http://www.pcisys.net/~melanson/codecs/ - * http://www.geocities.com/SiliconValley/8682/aud3.txt - * - * Implementation note: There is no definite file signature for AUD files. - * The demuxer uses a probabilistic strategy for content detection. This - * entails performing sanity checks on certain header values in order to - * qualify a file. Refer to wsaud_probe() for the precise parameters. - */ - -#include "libavutil/intreadwrite.h" -#include "avformat.h" -#include "internal.h" - -#define AUD_HEADER_SIZE 12 -#define AUD_CHUNK_PREAMBLE_SIZE 8 -#define AUD_CHUNK_SIGNATURE 0x0000DEAF - -#define FORM_TAG MKBETAG('F', 'O', 'R', 'M') -#define WVQA_TAG MKBETAG('W', 'V', 'Q', 'A') -#define VQHD_TAG MKBETAG('V', 'Q', 'H', 'D') -#define FINF_TAG MKBETAG('F', 'I', 'N', 'F') -#define SND0_TAG MKBETAG('S', 'N', 'D', '0') -#define SND1_TAG MKBETAG('S', 'N', 'D', '1') -#define SND2_TAG MKBETAG('S', 'N', 'D', '2') -#define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R') - -/* don't know what these tags are for, but acknowledge their existence */ -#define CINF_TAG MKBETAG('C', 'I', 'N', 'F') -#define CINH_TAG MKBETAG('C', 'I', 'N', 'H') -#define CIND_TAG MKBETAG('C', 'I', 'N', 'D') -#define PINF_TAG MKBETAG('P', 'I', 'N', 'F') -#define PINH_TAG MKBETAG('P', 'I', 'N', 'H') -#define PIND_TAG MKBETAG('P', 'I', 'N', 'D') -#define CMDS_TAG MKBETAG('C', 'M', 'D', 'S') - -#define VQA_HEADER_SIZE 0x2A -#define VQA_FRAMERATE 15 -#define VQA_PREAMBLE_SIZE 8 - -typedef struct WsAudDemuxContext { - int audio_samplerate; - int audio_channels; - int audio_bits; - enum CodecID audio_type; - int audio_stream_index; - int64_t audio_frame_counter; -} WsAudDemuxContext; - -typedef struct WsVqaDemuxContext { - int audio_samplerate; - int audio_channels; - int audio_bits; - - int audio_stream_index; - int video_stream_index; - - int64_t audio_frame_counter; -} WsVqaDemuxContext; - -static int wsaud_probe(AVProbeData *p) -{ - int field; - - /* Probabilistic content detection strategy: There is no file signature - * so perform sanity checks on various header parameters: - * 8000 <= sample rate (16 bits) <= 48000 ==> 40001 acceptable numbers - * flags <= 0x03 (2 LSBs are used) ==> 4 acceptable numbers - * compression type (8 bits) = 1 or 99 ==> 2 acceptable numbers - * first audio chunk signature (32 bits) ==> 1 acceptable number - * The number space contains 2^64 numbers. There are 40001 * 4 * 2 * 1 = - * 320008 acceptable number combinations. - */ - - if (p->buf_size < AUD_HEADER_SIZE + AUD_CHUNK_PREAMBLE_SIZE) - return 0; - - /* check sample rate */ - field = AV_RL16(&p->buf[0]); - if ((field < 8000) || (field > 48000)) - return 0; - - /* enforce the rule that the top 6 bits of this flags field are reserved (0); - * this might not be true, but enforce it until deemed unnecessary */ - if (p->buf[10] & 0xFC) - return 0; - - /* note: only check for WS IMA (type 99) right now since there is no - * support for type 1 */ - if (p->buf[11] != 99) - return 0; - - /* read ahead to the first audio chunk and validate the first header signature */ - if (AV_RL32(&p->buf[16]) != AUD_CHUNK_SIGNATURE) - return 0; - - /* return 1/2 certainty since this file check is a little sketchy */ - return AVPROBE_SCORE_MAX / 2; -} - -static int wsaud_read_header(AVFormatContext *s, - AVFormatParameters *ap) -{ - WsAudDemuxContext *wsaud = s->priv_data; - AVIOContext *pb = s->pb; - AVStream *st; - unsigned char header[AUD_HEADER_SIZE]; - - if (avio_read(pb, header, AUD_HEADER_SIZE) != AUD_HEADER_SIZE) - return AVERROR(EIO); - wsaud->audio_samplerate = AV_RL16(&header[0]); - if (header[11] == 99) - wsaud->audio_type = CODEC_ID_ADPCM_IMA_WS; - else - return AVERROR_INVALIDDATA; - - /* flag 0 indicates stereo */ - wsaud->audio_channels = (header[10] & 0x1) + 1; - /* flag 1 indicates 16 bit audio */ - wsaud->audio_bits = (((header[10] & 0x2) >> 1) + 1) * 8; - - /* initialize the audio decoder stream */ - st = avformat_new_stream(s, NULL); - if (!st) - return AVERROR(ENOMEM); - avpriv_set_pts_info(st, 33, 1, wsaud->audio_samplerate); - st->codec->codec_type = AVMEDIA_TYPE_AUDIO; - st->codec->codec_id = wsaud->audio_type; - st->codec->codec_tag = 0; /* no tag */ - st->codec->channels = wsaud->audio_channels; - st->codec->sample_rate = wsaud->audio_samplerate; - st->codec->bits_per_coded_sample = wsaud->audio_bits; - st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * - st->codec->bits_per_coded_sample / 4; - st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; - - wsaud->audio_stream_index = st->index; - wsaud->audio_frame_counter = 0; - - return 0; -} - -static int wsaud_read_packet(AVFormatContext *s, - AVPacket *pkt) -{ - WsAudDemuxContext *wsaud = s->priv_data; - AVIOContext *pb = s->pb; - unsigned char preamble[AUD_CHUNK_PREAMBLE_SIZE]; - unsigned int chunk_size; - int ret = 0; - - if (avio_read(pb, preamble, AUD_CHUNK_PREAMBLE_SIZE) != - AUD_CHUNK_PREAMBLE_SIZE) - return AVERROR(EIO); - - /* validate the chunk */ - if (AV_RL32(&preamble[4]) != AUD_CHUNK_SIGNATURE) - return AVERROR_INVALIDDATA; - - chunk_size = AV_RL16(&preamble[0]); - ret= av_get_packet(pb, pkt, chunk_size); - if (ret != chunk_size) - return AVERROR(EIO); - pkt->stream_index = wsaud->audio_stream_index; - pkt->pts = wsaud->audio_frame_counter; - pkt->pts /= wsaud->audio_samplerate; - - /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */ - wsaud->audio_frame_counter += (chunk_size * 2) / wsaud->audio_channels; - - return ret; -} - -static int wsvqa_probe(AVProbeData *p) -{ - /* need 12 bytes to qualify */ - if (p->buf_size < 12) - return 0; - - /* check for the VQA signatures */ - if ((AV_RB32(&p->buf[0]) != FORM_TAG) || - (AV_RB32(&p->buf[8]) != WVQA_TAG)) - return 0; - - return AVPROBE_SCORE_MAX; -} - -static int wsvqa_read_header(AVFormatContext *s, - AVFormatParameters *ap) -{ - WsVqaDemuxContext *wsvqa = s->priv_data; - AVIOContext *pb = s->pb; - AVStream *st; - unsigned char *header; - unsigned char scratch[VQA_PREAMBLE_SIZE]; - unsigned int chunk_tag; - unsigned int chunk_size; - - /* initialize the video decoder stream */ - st = avformat_new_stream(s, NULL); - if (!st) - return AVERROR(ENOMEM); - avpriv_set_pts_info(st, 33, 1, VQA_FRAMERATE); - wsvqa->video_stream_index = st->index; - st->codec->codec_type = AVMEDIA_TYPE_VIDEO; - st->codec->codec_id = CODEC_ID_WS_VQA; - st->codec->codec_tag = 0; /* no fourcc */ - - /* skip to the start of the VQA header */ - avio_seek(pb, 20, SEEK_SET); - - /* the VQA header needs to go to the decoder */ - st->codec->extradata_size = VQA_HEADER_SIZE; - st->codec->extradata = av_mallocz(VQA_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); - header = (unsigned char *)st->codec->extradata; - if (avio_read(pb, st->codec->extradata, VQA_HEADER_SIZE) != - VQA_HEADER_SIZE) { - av_free(st->codec->extradata); - return AVERROR(EIO); - } - st->codec->width = AV_RL16(&header[6]); - st->codec->height = AV_RL16(&header[8]); - - /* initialize the audio decoder stream for VQA v1 or nonzero samplerate */ - if (AV_RL16(&header[24]) || (AV_RL16(&header[0]) == 1 && AV_RL16(&header[2]) == 1)) { - st = avformat_new_stream(s, NULL); - if (!st) - return AVERROR(ENOMEM); - avpriv_set_pts_info(st, 33, 1, VQA_FRAMERATE); - st->codec->codec_type = AVMEDIA_TYPE_AUDIO; - if (AV_RL16(&header[0]) == 1) - st->codec->codec_id = CODEC_ID_WESTWOOD_SND1; - else - st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS; - st->codec->codec_tag = 0; /* no tag */ - st->codec->sample_rate = AV_RL16(&header[24]); - if (!st->codec->sample_rate) - st->codec->sample_rate = 22050; - st->codec->channels = header[26]; - if (!st->codec->channels) - st->codec->channels = 1; - st->codec->bits_per_coded_sample = 16; - st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * - st->codec->bits_per_coded_sample / 4; - st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; - - wsvqa->audio_stream_index = st->index; - wsvqa->audio_samplerate = st->codec->sample_rate; - wsvqa->audio_channels = st->codec->channels; - wsvqa->audio_frame_counter = 0; - } - - /* there are 0 or more chunks before the FINF chunk; iterate until - * FINF has been skipped and the file will be ready to be demuxed */ - do { - if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) { - av_free(st->codec->extradata); - return AVERROR(EIO); - } - chunk_tag = AV_RB32(&scratch[0]); - chunk_size = AV_RB32(&scratch[4]); - - /* catch any unknown header tags, for curiousity */ - switch (chunk_tag) { - case CINF_TAG: - case CINH_TAG: - case CIND_TAG: - case PINF_TAG: - case PINH_TAG: - case PIND_TAG: - case FINF_TAG: - case CMDS_TAG: - break; - - default: - av_log (s, AV_LOG_ERROR, " note: unknown chunk seen (%c%c%c%c)\n", - scratch[0], scratch[1], - scratch[2], scratch[3]); - break; - } - - avio_skip(pb, chunk_size); - } while (chunk_tag != FINF_TAG); - - return 0; -} - -static int wsvqa_read_packet(AVFormatContext *s, - AVPacket *pkt) -{ - WsVqaDemuxContext *wsvqa = s->priv_data; - AVIOContext *pb = s->pb; - int ret = -1; - unsigned char preamble[VQA_PREAMBLE_SIZE]; - unsigned int chunk_type; - unsigned int chunk_size; - int skip_byte; - - while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) { - chunk_type = AV_RB32(&preamble[0]); - chunk_size = AV_RB32(&preamble[4]); - skip_byte = chunk_size & 0x01; - - if ((chunk_type == SND2_TAG || chunk_type == SND1_TAG) && wsvqa->audio_channels == 0) { - av_log(s, AV_LOG_ERROR, "audio chunk without any audio header information found\n"); - return AVERROR_INVALIDDATA; - } - - if ((chunk_type == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) { - - if (av_new_packet(pkt, chunk_size)) - return AVERROR(EIO); - ret = avio_read(pb, pkt->data, chunk_size); - if (ret != chunk_size) { - av_free_packet(pkt); - return AVERROR(EIO); - } - - if (chunk_type == SND2_TAG) { - pkt->stream_index = wsvqa->audio_stream_index; - /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */ - wsvqa->audio_frame_counter += (chunk_size * 2) / wsvqa->audio_channels; - } else if(chunk_type == SND1_TAG) { - pkt->stream_index = wsvqa->audio_stream_index; - /* unpacked size is stored in header */ - wsvqa->audio_frame_counter += AV_RL16(pkt->data) / wsvqa->audio_channels; - } else { - pkt->stream_index = wsvqa->video_stream_index; - } - /* stay on 16-bit alignment */ - if (skip_byte) - avio_skip(pb, 1); - - return ret; - } else { - switch(chunk_type){ - case CMDS_TAG: - case SND0_TAG: - break; - default: - av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type); - } - avio_skip(pb, chunk_size + skip_byte); - } - } - - return ret; -} - -#if CONFIG_WSAUD_DEMUXER -AVInputFormat ff_wsaud_demuxer = { - .name = "wsaud", - .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios audio format"), - .priv_data_size = sizeof(WsAudDemuxContext), - .read_probe = wsaud_probe, - .read_header = wsaud_read_header, - .read_packet = wsaud_read_packet, -}; -#endif -#if CONFIG_WSVQA_DEMUXER -AVInputFormat ff_wsvqa_demuxer = { - .name = "wsvqa", - .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA format"), - .priv_data_size = sizeof(WsVqaDemuxContext), - .read_probe = wsvqa_probe, - .read_header = wsvqa_read_header, - .read_packet = wsvqa_read_packet, -}; -#endif |