/* * RAW encoder and decoder * Copyright (c) 2001 Fabrice Bellard. * Copyright (c) 2005 Alex Beregszaszi * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */#include "avformat.h"#ifdef CONFIG_MUXERS/* simple formats */static int raw_write_header(struct AVFormatContext *s){    return 0;}static int raw_write_packet(struct AVFormatContext *s, AVPacket *pkt){    put_buffer(&s->pb, pkt->data, pkt->size);    put_flush_packet(&s->pb);    return 0;}static int raw_write_trailer(struct AVFormatContext *s){    return 0;}#endif //CONFIG_MUXERS/* raw input */static int raw_read_header(AVFormatContext *s, AVFormatParameters *ap){    AVStream *st;    int id;    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;        id = s->iformat->value;        if (id == CODEC_ID_RAWVIDEO) {            st->codec->codec_type = CODEC_TYPE_VIDEO;        } else {            st->codec->codec_type = CODEC_TYPE_AUDIO;        }        st->codec->codec_id = id;        switch(st->codec->codec_type) {        case CODEC_TYPE_AUDIO:            st->codec->sample_rate = ap->sample_rate;            st->codec->channels = ap->channels;            av_set_pts_info(st, 64, 1, st->codec->sample_rate);            break;        case CODEC_TYPE_VIDEO:            av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);            st->codec->width = ap->width;            st->codec->height = ap->height;            st->codec->pix_fmt = ap->pix_fmt;            if(st->codec->pix_fmt == PIX_FMT_NONE)                st->codec->pix_fmt= PIX_FMT_YUV420P;            break;        default:            return -1;        }    return 0;}#define RAW_PACKET_SIZE 1024static int raw_read_packet(AVFormatContext *s, AVPacket *pkt){    int ret, size;    //    AVStream *st = s->streams[0];    size= RAW_PACKET_SIZE;    ret= av_get_packet(&s->pb, pkt, size);    pkt->stream_index = 0;    if (ret <= 0) {        return AVERROR_IO;    }    /* note: we need to modify the packet size here to handle the last       packet */    pkt->size = ret;    return ret;}static int raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt){    int ret, size;    size = RAW_PACKET_SIZE;    if (av_new_packet(pkt, size) < 0)        return AVERROR_IO;    pkt->pos= url_ftell(&s->pb);    pkt->stream_index = 0;    ret = get_partial_buffer(&s->pb, pkt->data, size);    if (ret <= 0) {        av_free_packet(pkt);        return AVERROR_IO;    }    pkt->size = ret;    return ret;}// http://www.artificis.hu/files/texts/ingenient.txtstatic int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt){    int ret, size, w, h, unk1, unk2;    if (get_le32(&s->pb) != MKTAG('M', 'J', 'P', 'G'))        return AVERROR_IO; // FIXME    size = get_le32(&s->pb);    w = get_le16(&s->pb);    h = get_le16(&s->pb);    url_fskip(&s->pb, 8); // zero + size (padded?)    url_fskip(&s->pb, 2);    unk1 = get_le16(&s->pb);    unk2 = get_le16(&s->pb);    url_fskip(&s->pb, 22); // ascii timestamp    av_log(NULL, AV_LOG_DEBUG, "Ingenient packet: size=%d, width=%d, height=%d, unk1=%d unk2=%d\n",        size, w, h, unk1, unk2);    if (av_new_packet(pkt, size) < 0)        return AVERROR_IO;    pkt->pos = url_ftell(&s->pb);    pkt->stream_index = 0;    ret = get_buffer(&s->pb, pkt->data, size);    if (ret <= 0) {        av_free_packet(pkt);        return AVERROR_IO;    }    pkt->size = ret;    return ret;}static int raw_read_close(AVFormatContext *s){    return 0;}int pcm_read_seek(AVFormatContext *s,                  int stream_index, int64_t timestamp, int flags){    AVStream *st;    int block_align, byte_rate;    int64_t pos;    st = s->streams[0];    switch(st->codec->codec_id) {    case CODEC_ID_PCM_S16LE:    case CODEC_ID_PCM_S16BE:    case CODEC_ID_PCM_U16LE:    case CODEC_ID_PCM_U16BE:        block_align = 2 * st->codec->channels;        byte_rate = block_align * st->codec->sample_rate;        break;    case CODEC_ID_PCM_S8:    case CODEC_ID_PCM_U8:    case CODEC_ID_PCM_MULAW:    case CODEC_ID_PCM_ALAW:        block_align = st->codec->channels;        byte_rate = block_align * st->codec->sample_rate;        break;    default:        block_align = st->codec->block_align;        byte_rate = st->codec->bit_rate / 8;        break;    }    if (block_align <= 0 || byte_rate <= 0)        return -1;    /* compute the position by aligning it to block_align */    pos = av_rescale_rnd(timestamp * byte_rate,                         st->time_base.num,                         st->time_base.den * (int64_t)block_align,                         (flags & AVSEEK_FLAG_BACKWARD) ? AV_ROUND_DOWN : AV_ROUND_UP);    pos *= block_align;    /* recompute exact position */    st->cur_dts = av_rescale(pos, st->time_base.den, byte_rate * (int64_t)st->time_base.num);    url_fseek(&s->pb, pos + s->data_offset, SEEK_SET);    return 0;}/* ac3 read */static int ac3_read_header(AVFormatContext *s,                           AVFormatParameters *ap){    AVStream *st;    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;    st->codec->codec_type = CODEC_TYPE_AUDIO;    st->codec->codec_id = CODEC_ID_AC3;    st->need_parsing = 1;    /* the parameters will be extracted from the compressed bitstream */    return 0;}static int shorten_read_header(AVFormatContext *s,                               AVFormatParameters *ap){    AVStream *st;    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;    st->codec->codec_type = CODEC_TYPE_AUDIO;    st->codec->codec_id = CODEC_ID_SHORTEN;    st->need_parsing = 1;    /* the parameters will be extracted from the compressed bitstream */    return 0;}/* dts read */static int dts_read_header(AVFormatContext *s,                           AVFormatParameters *ap){    AVStream *st;    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;    st->codec->codec_type = CODEC_TYPE_AUDIO;    st->codec->codec_id = CODEC_ID_DTS;    st->need_parsing = 1;    /* the parameters will be extracted from the compressed bitstream */    return 0;}/* aac read */static int aac_read_header(AVFormatContext *s,                           AVFormatParameters *ap){    AVStream *st;    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;    st->codec->codec_type = CODEC_TYPE_AUDIO;    st->codec->codec_id = CODEC_ID_AAC;    st->need_parsing = 1;    /* the parameters will be extracted from the compressed bitstream */    return 0;}/* mpeg1/h263 input */static int video_read_header(AVFormatContext *s,                             AVFormatParameters *ap){    AVStream *st;    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;    st->codec->codec_type = CODEC_TYPE_VIDEO;    st->codec->codec_id = s->iformat->value;    st->need_parsing = 1;    /* for mjpeg, specify frame rate */    /* for mpeg4 specify it too (most mpeg4 streams dont have the fixed_vop_rate set ...)*/    if (ap->time_base.num) {        av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);    } else if ( st->codec->codec_id == CODEC_ID_MJPEG ||                st->codec->codec_id == CODEC_ID_MPEG4 ||                st->codec->codec_id == CODEC_ID_H264) {        av_set_pts_info(st, 64, 1, 25);    }    return 0;}#define SEQ_START_CODE          0x000001b3#define GOP_START_CODE          0x000001b8#define PICTURE_START_CODE      0x00000100#define SLICE_START_CODE        0x00000101#define PACK_START_CODE         0x000001ba#define VIDEO_ID                0x000001e0#define AUDIO_ID                0x000001c0static int mpegvideo_probe(AVProbeData *p){    uint32_t code= -1;    int pic=0, seq=0, slice=0, pspack=0, pes=0;    int i;    for(i=0; i<p->buf_size; i++){        code = (code<<8) + p->buf[i];        if ((code & 0xffffff00) == 0x100) {            switch(code){            case     SEQ_START_CODE:   seq++; break;            case PICTURE_START_CODE:   pic++; break;            case   SLICE_START_CODE: slice++; break;            case    PACK_START_CODE: pspack++; break;            case           VIDEO_ID:            case           AUDIO_ID:   pes++; break;            }        }    }    if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !pes)        return AVPROBE_SCORE_MAX/2+1; // +1 for .mpg    return 0;}static int h263_probe(AVProbeData *p){    int code;    const uint8_t *d;    if (p->buf_size < 6)        return 0;    d = p->buf;    code = (d[0] << 14) | (d[1] << 6) | (d[2] >> 2);    if (code == 0x20) {        return 50;    }    return 0;}static int h261_probe(AVProbeData *p){    int code;    const uint8_t *d;    if (p->buf_size < 6)        return 0;    d = p->buf;    code = (d[0] << 12) | (d[1] << 4) | (d[2] >> 4);    if (code == 0x10) {        return 50;    }    return 0;}AVInputFormat shorten_iformat = {    "shn",    "raw shorten",    0,    NULL,    shorten_read_header,    raw_read_partial_packet,    raw_read_close,    .extensions = "shn",};AVInputFormat ac3_iformat = {    "ac3",    "raw ac3",    0,    NULL,    ac3_read_header,    raw_read_partial_packet,    raw_read_close,    .extensions = "ac3",};#ifdef CONFIG_MUXERSAVOutputFormat ac3_oformat = {    "ac3",    "raw ac3",    "audio/x-ac3",    "ac3",    0,    CODEC_ID_AC3,    0,    raw_write_header,    raw_write_packet,    raw_write_trailer,};#endif //CONFIG_MUXERSAVInputFormat dts_iformat = {    "dts",    "raw dts",    0,    NULL,    dts_read_header,    raw_read_partial_packet,    raw_read_close,    .extensions = "dts",};AVInputFormat aac_iformat = {