static int xwma_read_header(AVFormatContext *s, AVFormatParameters *ap)

{

    int64_t size, av_uninit(data_size);

    uint32_t dpds_table_size = 0;

    uint32_t *dpds_table = 0;

    unsigned int tag;

    AVIOContext *pb = s->pb;

    AVStream *st;

    XWMAContext *xwma = s->priv_data;

    int i;



    /* The following code is mostly copied from wav.c, with some

     * minor alterations.

     */



    /* check RIFF header */

    tag = avio_rl32(pb);

    if (tag != MKTAG('R', 'I', 'F', 'F'))

        return -1;

    avio_rl32(pb); /* file size */

    tag = avio_rl32(pb);

    if (tag != MKTAG('X', 'W', 'M', 'A'))

        return -1;



    /* parse fmt header */

    tag = avio_rl32(pb);

    if (tag != MKTAG('f', 'm', 't', ' '))

        return -1;

    size = avio_rl32(pb);

    st = av_new_stream(s, 0);

    if (!st)

        return AVERROR(ENOMEM);



    ff_get_wav_header(pb, st->codec, size);

    st->need_parsing = AVSTREAM_PARSE_NONE;



    /* All xWMA files I have seen contained WMAv2 data. If there are files

     * using WMA Pro or some other codec, then we need to figure out the right

     * extradata for that. Thus, ask the user for feedback, but try to go on

     * anyway.

     */

    if (st->codec->codec_id != CODEC_ID_WMAV2) {

        av_log(s, AV_LOG_WARNING, "unexpected codec (tag 0x04%x; id %d)\n",

                              st->codec->codec_tag, st->codec->codec_id);

        av_log_ask_for_sample(s, NULL);

    } else {

        /* In all xWMA files I have seen, there is no extradata. But the WMA

         * codecs require extradata, so we provide our own fake extradata.

         *

         * First, check that there really was no extradata in the header. If

         * there was, then try to use, after asking the the user to provide a

         * sample of this unusual file.

         */

        if (st->codec->extradata_size != 0) {

            /* Surprise, surprise: We *did* get some extradata. No idea

             * if it will work, but just go on and try it, after asking

             * the user for a sample.

             */

            av_log(s, AV_LOG_WARNING, "unexpected extradata (%d bytes)\n",

                                  st->codec->extradata_size);

            av_log_ask_for_sample(s, NULL);

        } else {

            st->codec->extradata_size = 6;

            st->codec->extradata      = av_mallocz(6 + FF_INPUT_BUFFER_PADDING_SIZE);

            if (!st->codec->extradata)

                return AVERROR(ENOMEM);



            /* setup extradata with our experimentally obtained value */

            st->codec->extradata[4] = 31;

        }

    }



    /* set the sample rate */

    av_set_pts_info(st, 64, 1, st->codec->sample_rate);



    /* parse the remaining RIFF chunks */

    for (;;) {

        if (pb->eof_reached)

            return -1;

        /* read next chunk tag */

        tag = avio_rl32(pb);

        size = avio_rl32(pb);

        if (tag == MKTAG('d', 'a', 't', 'a')) {

            /* We assume that the data chunk comes last. */

            break;

        } else if (tag == MKTAG('d','p','d','s')) {

            /* Quoting the MSDN xWMA docs on the dpds chunk: "Contains the

             * decoded packet cumulative data size array, each element is the

             * number of bytes accumulated after the corresponding xWMA packet

             * is decoded in order"

             *

             * Each packet has size equal to st->codec->block_align, which in

             * all cases I saw so far was always 2230. Thus, we can use the

             * dpds data to compute a seeking index.

             */



            /* Error out if there is more than one dpds chunk. */

            if (dpds_table) {

                av_log(s, AV_LOG_ERROR, "two dpds chunks present\n");

                return -1;

            }



            /* Compute the number of entries in the dpds chunk. */

            if (size & 3) {  /* Size should be divisible by four */

                av_log(s, AV_LOG_WARNING, "dpds chunk size "PRId64" not divisible by 4\n", size);

            }

            dpds_table_size = size / 4;

            if (dpds_table_size == 0 || dpds_table_size >= INT_MAX / 4) {

                av_log(s, AV_LOG_ERROR, "dpds chunk size "PRId64" invalid\n", size);

                return -1;

            }



            /* Allocate some temporary storage to keep the dpds data around.

             * for processing later on.

             */

            dpds_table = av_malloc(dpds_table_size * sizeof(uint32_t));

            if (!dpds_table) {

                return AVERROR(ENOMEM);

            }



            for (i = 0; i < dpds_table_size; ++i) {

                dpds_table[i] = avio_rl32(pb);

                size -= 4;

            }

        }

        avio_skip(pb, size);

    }



    /* Determine overall data length */

    if (size < 0)

        return -1;

    if (!size) {

        xwma->data_end = INT64_MAX;

    } else

        xwma->data_end = avio_tell(pb) + size;





    if (dpds_table && dpds_table_size) {

        int64_t cur_pos;

        const uint32_t bytes_per_sample

                = (st->codec->channels * st->codec->bits_per_coded_sample) >> 3;



        /* Estimate the duration from the total number of output bytes. */

        const uint64_t total_decoded_bytes = dpds_table[dpds_table_size - 1];

        st->duration = total_decoded_bytes / bytes_per_sample;



        /* Use the dpds data to build a seek table.  We can only do this after

         * we know the offset to the data chunk, as we need that to determine

         * the actual offset to each input block.

         * Note: If we allowed ourselves to assume that the data chunk always

         * follows immediately after the dpds block, we could of course guess

         * the data block's start offset already while reading the dpds chunk.

         * I decided against that, just in case other chunks ever are

         * discovered.

         */

        cur_pos = avio_tell(pb);

        for (i = 0; i < dpds_table_size; ++i) {

            /* From the number of output bytes that would accumulate in the

             * output buffer after decoding the first (i+1) packets, we compute

             * an offset / timestamp pair.

             */

            av_add_index_entry(st,

                               cur_pos + (i+1) * st->codec->block_align, /* pos */

                               dpds_table[i] / bytes_per_sample,         /* timestamp */

                               st->codec->block_align,                   /* size */

                               0,                                        /* duration */

                               AVINDEX_KEYFRAME);

        }

    } else if (st->codec->bit_rate) {

        /* No dpds chunk was present (or only an empty one), so estimate

         * the total duration using the average bits per sample and the

         * total data length.

         */

        st->duration = (size<<3) * st->codec->sample_rate / st->codec->bit_rate;

    }



    av_free(dpds_table);



    return 0;

}

static int xwma_read_header(AVFormatContext *s, AVFormatParameters *ap)

{

    int64_t size, av_uninit(data_size);

    uint32_t dpds_table_size = 0;

    uint32_t *dpds_table = 0;

    unsigned int tag;

    AVIOContext *pb = s->pb;

    AVStream *st;

    XWMAContext *xwma = s->priv_data;

    int i;



    







    

    tag = avio_rl32(pb);

    if (tag != MKTAG('R', 'I', 'F', 'F'))

        return -1;

    avio_rl32(pb); 

    tag = avio_rl32(pb);

    if (tag != MKTAG('X', 'W', 'M', 'A'))

        return -1;



    

    tag = avio_rl32(pb);

    if (tag != MKTAG('f', 'm', 't', ' '))

        return -1;

    size = avio_rl32(pb);

    st = av_new_stream(s, 0);

    if (!st)

        return AVERROR(ENOMEM);



    ff_get_wav_header(pb, st->codec, size);

    st->need_parsing = AVSTREAM_PARSE_NONE;



    









    if (st->codec->codec_id != CODEC_ID_WMAV2) {

        av_log(s, AV_LOG_WARNING, "unexpected codec (tag 0x04%x; id %d)\n",

                              st->codec->codec_tag, st->codec->codec_id);

        av_log_ask_for_sample(s, NULL);

    } else {

        













        if (st->codec->extradata_size != 0) {

            







            av_log(s, AV_LOG_WARNING, "unexpected extradata (%d bytes)\n",

                                  st->codec->extradata_size);

            av_log_ask_for_sample(s, NULL);

        } else {

            st->codec->extradata_size = 6;

            st->codec->extradata      = av_mallocz(6 + FF_INPUT_BUFFER_PADDING_SIZE);

            if (!st->codec->extradata)

                return AVERROR(ENOMEM);



            

            st->codec->extradata[4] = 31;

        }

    }



    

    av_set_pts_info(st, 64, 1, st->codec->sample_rate);



    

    for (;;) {

        if (pb->eof_reached)

            return -1;

        

        tag = avio_rl32(pb);

        size = avio_rl32(pb);

        if (tag == MKTAG('d', 'a', 't', 'a')) {

            

            break;

        } else if (tag == MKTAG('d','p','d','s')) {

            



















            

            if (dpds_table) {

                av_log(s, AV_LOG_ERROR, "two dpds chunks present\n");

                return -1;

            }



            

            if (size & 3) {  

                av_log(s, AV_LOG_WARNING, "dpds chunk size "PRId64" not divisible by 4\n", size);

            }

            dpds_table_size = size / 4;

            if (dpds_table_size == 0 || dpds_table_size >= INT_MAX / 4) {

                av_log(s, AV_LOG_ERROR, "dpds chunk size "PRId64" invalid\n", size);

                return -1;

            }



            





            dpds_table = av_malloc(dpds_table_size * sizeof(uint32_t));

            if (!dpds_table) {

                return AVERROR(ENOMEM);

            }



            for (i = 0; i < dpds_table_size; ++i) {

                dpds_table[i] = avio_rl32(pb);

                size -= 4;

            }

        }

        avio_skip(pb, size);

    }



    

    if (size < 0)

        return -1;

    if (!size) {

        xwma->data_end = INT64_MAX;

    } else

        xwma->data_end = avio_tell(pb) + size;





    if (dpds_table && dpds_table_size) {

        int64_t cur_pos;

        const uint32_t bytes_per_sample

                = (st->codec->channels * st->codec->bits_per_coded_sample) >> 3;



        

        const uint64_t total_decoded_bytes = dpds_table[dpds_table_size - 1];

        st->duration = total_decoded_bytes / bytes_per_sample;



        

















        cur_pos = avio_tell(pb);

        for (i = 0; i < dpds_table_size; ++i) {

            







            av_add_index_entry(st,

                               cur_pos + (i+1) * st->codec->block_align, 

                               dpds_table[i] / bytes_per_sample,         

                               st->codec->block_align,                   

                               0,                                        

                               AVINDEX_KEYFRAME);

        }

    } else if (st->codec->bit_rate) {

        







        st->duration = (size<<3) * st->codec->sample_rate / st->codec->bit_rate;

    }



    av_free(dpds_table);



    return 0;

}

    ff_get_wav_header(pb, st->codec, size);     ff_get_wav_header(pb, st->codec, size);
static int FUNC_0(AVFormatContext *VAR_0, AVFormatParameters *VAR_1)

{

    int64_t size, av_uninit(data_size);

    uint32_t dpds_table_size = 0;

    uint32_t *dpds_table = 0;

    unsigned int VAR_2;

    AVIOContext *pb = VAR_0->pb;

    AVStream *st;

    XWMAContext *xwma = VAR_0->priv_data;

    int VAR_3;



    







    

    VAR_2 = avio_rl32(pb);

    if (VAR_2 != MKTAG('R', 'I', 'F', 'F'))

        return -1;

    avio_rl32(pb); 

    VAR_2 = avio_rl32(pb);

    if (VAR_2 != MKTAG('X', 'W', 'M', 'A'))

        return -1;



    

    VAR_2 = avio_rl32(pb);

    if (VAR_2 != MKTAG('f', 'm', 't', ' '))

        return -1;

    size = avio_rl32(pb);

    st = av_new_stream(VAR_0, 0);

    if (!st)

        return AVERROR(ENOMEM);



    ff_get_wav_header(pb, st->codec, size);

    st->need_parsing = AVSTREAM_PARSE_NONE;



    









    if (st->codec->codec_id != CODEC_ID_WMAV2) {

        av_log(VAR_0, AV_LOG_WARNING, "unexpected codec (VAR_2 0x04%x; id %d)\n",

                              st->codec->codec_tag, st->codec->codec_id);

        av_log_ask_for_sample(VAR_0, NULL);

    } else {

        













        if (st->codec->extradata_size != 0) {

            







            av_log(VAR_0, AV_LOG_WARNING, "unexpected extradata (%d bytes)\n",

                                  st->codec->extradata_size);

            av_log_ask_for_sample(VAR_0, NULL);

        } else {

            st->codec->extradata_size = 6;

            st->codec->extradata      = av_mallocz(6 + FF_INPUT_BUFFER_PADDING_SIZE);

            if (!st->codec->extradata)

                return AVERROR(ENOMEM);



            

            st->codec->extradata[4] = 31;

        }

    }



    

    av_set_pts_info(st, 64, 1, st->codec->sample_rate);



    

    for (;;) {

        if (pb->eof_reached)

            return -1;

        

        VAR_2 = avio_rl32(pb);

        size = avio_rl32(pb);

        if (VAR_2 == MKTAG('d', 'a', 't', 'a')) {

            

            break;

        } else if (VAR_2 == MKTAG('d','p','d','VAR_0')) {

            



















            

            if (dpds_table) {

                av_log(VAR_0, AV_LOG_ERROR, "two dpds chunks present\n");

                return -1;

            }



            

            if (size & 3) {  

                av_log(VAR_0, AV_LOG_WARNING, "dpds chunk size "PRId64" not divisible by 4\n", size);

            }

            dpds_table_size = size / 4;

            if (dpds_table_size == 0 || dpds_table_size >= INT_MAX / 4) {

                av_log(VAR_0, AV_LOG_ERROR, "dpds chunk size "PRId64" invalid\n", size);

                return -1;

            }



            





            dpds_table = av_malloc(dpds_table_size * sizeof(uint32_t));

            if (!dpds_table) {

                return AVERROR(ENOMEM);

            }



            for (VAR_3 = 0; VAR_3 < dpds_table_size; ++VAR_3) {

                dpds_table[VAR_3] = avio_rl32(pb);

                size -= 4;

            }

        }

        avio_skip(pb, size);

    }



    

    if (size < 0)

        return -1;

    if (!size) {

        xwma->data_end = INT64_MAX;

    } else

        xwma->data_end = avio_tell(pb) + size;





    if (dpds_table && dpds_table_size) {

        int64_t cur_pos;

        const uint32_t VAR_4

                = (st->codec->channels * st->codec->bits_per_coded_sample) >> 3;



        

        const uint64_t VAR_5 = dpds_table[dpds_table_size - 1];

        st->duration = VAR_5 / VAR_4;



        

















        cur_pos = avio_tell(pb);

        for (VAR_3 = 0; VAR_3 < dpds_table_size; ++VAR_3) {

            







            av_add_index_entry(st,

                               cur_pos + (VAR_3+1) * st->codec->block_align, 

                               dpds_table[VAR_3] / VAR_4,         

                               st->codec->block_align,                   

                               0,                                        

                               AVINDEX_KEYFRAME);

        }

    } else if (st->codec->bit_rate) {

        







        st->duration = (size<<3) * st->codec->sample_rate / st->codec->bit_rate;

    }



    av_free(dpds_table);



    return 0;

}

static int FUNC_0(AVFormatContext *VAR_0, AVFormatParameters *VAR_1)
{ int64_t size, av_uninit(data_size); uint32_t dpds_table_size = 0; uint32_t *dpds_table = 0; unsigned int VAR_2; AVIOContext *pb = VAR_0->pb; AVStream *st; XWMAContext *xwma = VAR_0->priv_data; int VAR_3; VAR_2 = avio_rl32(pb); if (VAR_2 != MKTAG('R', 'I', 'F', 'F'))
return -1; avio_rl32(pb); VAR_2 = avio_rl32(pb); if (VAR_2 != MKTAG('X', 'W', 'M', 'A'))
return -1; VAR_2 = avio_rl32(pb); if (VAR_2 != MKTAG('f', 'm', 't', ' '))
return -1; size = avio_rl32(pb); st = av_new_stream(VAR_0, 0); if (!st)
return AVERROR(ENOMEM); ff_get_wav_header(pb, st->codec, size); st->need_parsing = AVSTREAM_PARSE_NONE; if (st->codec->codec_id != CODEC_ID_WMAV2) { av_log(VAR_0, AV_LOG_WARNING, "unexpected codec (VAR_2 0x04%x; id %d)\n", st->codec->codec_tag, st->codec->codec_id); av_log_ask_for_sample(VAR_0, NULL); } else { if (st->codec->extradata_size != 0) { av_log(VAR_0, AV_LOG_WARNING, "unexpected extradata (%d bytes)\n",
st->codec->extradata_size); av_log_ask_for_sample(VAR_0, NULL); } else { st->codec->extradata_size = 6; st->codec->extradata      = av_mallocz(6 + FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata)
return AVERROR(ENOMEM); st->codec->extradata[4] = 31; } } av_set_pts_info(st, 64, 1, st->codec->sample_rate); for (;;) { if (pb->eof_reached)
return -1; VAR_2 = avio_rl32(pb); size = avio_rl32(pb); if (VAR_2 == MKTAG('d', 'a', 't', 'a')) { break; } else if (VAR_2 == MKTAG('d','p','d','VAR_0')) { if (dpds_table) { av_log(VAR_0, AV_LOG_ERROR, "two dpds chunks present\n"); return -1; } if (size & 3) { av_log(VAR_0, AV_LOG_WARNING, "dpds chunk size "PRId64" not divisible by 4\n", size); } dpds_table_size = size / 4; if (dpds_table_size == 0 || dpds_table_size >= INT_MAX / 4) { av_log(VAR_0, AV_LOG_ERROR, "dpds chunk size "PRId64" invalid\n", size); return -1; } dpds_table = av_malloc(dpds_table_size * sizeof(uint32_t)); if (!dpds_table) { return AVERROR(ENOMEM); } for (VAR_3 = 0; VAR_3 < dpds_table_size; ++VAR_3) { dpds_table[VAR_3] = avio_rl32(pb); size -= 4; } } avio_skip(pb, size); } if (size < 0)
return -1; if (!size) { xwma->data_end = INT64_MAX; } else xwma->data_end = avio_tell(pb) + size; if (dpds_table && dpds_table_size) { int64_t cur_pos; const uint32_t VAR_4
= (st->codec->channels * st->codec->bits_per_coded_sample) >> 3; const uint64_t VAR_5 = dpds_table[dpds_table_size - 1]; st->duration = VAR_5 / VAR_4; cur_pos = avio_tell(pb); for (VAR_3 = 0; VAR_3 < dpds_table_size; ++VAR_3) { av_add_index_entry(st,
cur_pos + (VAR_3+1) * st->codec->block_align,
dpds_table[VAR_3] / VAR_4,
st->codec->block_align,
0,
AVINDEX_KEYFRAME); } } else if (st->codec->bit_rate) { st->duration = (size<<3) * st->codec->sample_rate / st->codec->bit_rate; } av_free(dpds_table); return 0; }