[deb_ffmpeg.git] / ffmpeg / libavformat / xwma.c

/*
 * xWMA demuxer
 * Copyright (c) 2011 Max Horn
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <inttypes.h>
#include <stdint.h>

#include "avformat.h"
#include "internal.h"
#include "riff.h"

/*
 * Demuxer for xWMA, a Microsoft audio container used by XAudio 2.
 */

typedef struct {
    int64_t data_end;
} XWMAContext;

static int xwma_probe(AVProbeData *p)
{
    if (!memcmp(p->buf, "RIFF", 4) && !memcmp(p->buf + 8, "XWMA", 4))
        return AVPROBE_SCORE_MAX;
    return 0;
}

static int xwma_read_header(AVFormatContext *s)
{
    int64_t size;
    int ret;
    uint32_t dpds_table_size = 0;
    uint32_t *dpds_table = NULL;
    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 = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

    ret = ff_get_wav_header(pb, st->codec, size);
    if (ret < 0)
        return ret;
    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 != AV_CODEC_ID_WMAV2) {
        avpriv_request_sample(s, "Unexpected codec (tag 0x04%x; id %d)",
                              st->codec->codec_tag, st->codec->codec_id);
    } 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 it, after asking 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.
             */
            avpriv_request_sample(s, "Unexpected extradata (%d bytes)",
                                  st->codec->extradata_size);
        } 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;
        }
    }

    if (!st->codec->channels) {
        av_log(s, AV_LOG_WARNING, "Invalid channel count: %d\n",
               st->codec->channels);
        return AVERROR_INVALIDDATA;
    }
    if (!st->codec->bits_per_coded_sample) {
        av_log(s, AV_LOG_WARNING, "Invalid bits_per_coded_sample: %d\n",
               st->codec->bits_per_coded_sample);
        return AVERROR_INVALIDDATA;
    }

    /* set the sample rate */
    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);

    /* parse the remaining RIFF chunks */
    for (;;) {
        if (pb->eof_reached) {
            ret = AVERROR_EOF;
            goto end;
        }
        /* 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");
                ret = AVERROR_INVALIDDATA;
                goto end;
            }

            /* 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 AVERROR_INVALIDDATA;
            }

            /* 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) {
        ret = AVERROR_INVALIDDATA;
        goto end;
    }
    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];

        if (!bytes_per_sample) {
            av_log(s, AV_LOG_ERROR,
                   "Invalid bits_per_coded_sample %d for %d channels\n",
                   st->codec->bits_per_coded_sample, st->codec->channels);
            ret = AVERROR_INVALIDDATA;
            goto end;
        }

        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;
    }

end:
    av_free(dpds_table);

    return ret;
}

static int xwma_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int ret, size;
    int64_t left;
    AVStream *st;
    XWMAContext *xwma = s->priv_data;

    st = s->streams[0];

    left = xwma->data_end - avio_tell(s->pb);
    if (left <= 0) {
        return AVERROR_EOF;
    }

    /* read a single block; the default block size is 2230. */
    size = (st->codec->block_align > 1) ? st->codec->block_align : 2230;
    size = FFMIN(size, left);

    ret  = av_get_packet(s->pb, pkt, size);
    if (ret < 0)
        return ret;

    pkt->stream_index = 0;
    return ret;
}

AVInputFormat ff_xwma_demuxer = {
    .name           = "xwma",
    .long_name      = NULL_IF_CONFIG_SMALL("Microsoft xWMA"),
    .priv_data_size = sizeof(XWMAContext),
    .read_probe     = xwma_probe,
    .read_header    = xwma_read_header,
    .read_packet    = xwma_read_packet,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* xWMA demuxer
	3	* Copyright (c) 2011 Max Horn
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include <inttypes.h>
	23	#include <stdint.h>
	24
	25	#include "avformat.h"
	26	#include "internal.h"
	27	#include "riff.h"
	28
	29	/*
	30	* Demuxer for xWMA, a Microsoft audio container used by XAudio 2.
	31	*/
	32
	33	typedef struct {
	34	int64_t data_end;
	35	} XWMAContext;
	36
	37	static int xwma_probe(AVProbeData *p)
	38	{
	39	if (!memcmp(p->buf, "RIFF", 4) && !memcmp(p->buf + 8, "XWMA", 4))
	40	return AVPROBE_SCORE_MAX;
	41	return 0;
	42	}
	43
	44	static int xwma_read_header(AVFormatContext *s)
	45	{
	46	int64_t size;
	47	int ret;
	48	uint32_t dpds_table_size = 0;
	49	uint32_t *dpds_table = NULL;
	50	unsigned int tag;
	51	AVIOContext *pb = s->pb;
	52	AVStream *st;
	53	XWMAContext *xwma = s->priv_data;
	54	int i;
	55
	56	/* The following code is mostly copied from wav.c, with some
	57	* minor alterations.
	58	*/
	59
	60	/* check RIFF header */
	61	tag = avio_rl32(pb);
	62	if (tag != MKTAG('R', 'I', 'F', 'F'))
	63	return -1;
	64	avio_rl32(pb); /* file size */
65	tag = avio_rl32(pb);
66	if (tag != MKTAG('X', 'W', 'M', 'A'))
67	return -1;
68
69	/* parse fmt header */
70	tag = avio_rl32(pb);
71	if (tag != MKTAG('f', 'm', 't', ' '))
72	return -1;
73	size = avio_rl32(pb);
74	st = avformat_new_stream(s, NULL);
75	if (!st)
76	return AVERROR(ENOMEM);
77
78	ret = ff_get_wav_header(pb, st->codec, size);
79	if (ret < 0)
80	return ret;
81	st->need_parsing = AVSTREAM_PARSE_NONE;
82
83	/* All xWMA files I have seen contained WMAv2 data. If there are files
84	* using WMA Pro or some other codec, then we need to figure out the right
85	* extradata for that. Thus, ask the user for feedback, but try to go on
86	* anyway.
87	*/
88	if (st->codec->codec_id != AV_CODEC_ID_WMAV2) {
89	avpriv_request_sample(s, "Unexpected codec (tag 0x04%x; id %d)",
90	st->codec->codec_tag, st->codec->codec_id);
91	} else {
92	/* In all xWMA files I have seen, there is no extradata. But the WMA
93	* codecs require extradata, so we provide our own fake extradata.
94	*
95	* First, check that there really was no extradata in the header. If
96	* there was, then try to use it, after asking the user to provide a
97	* sample of this unusual file.
98	*/
99	if (st->codec->extradata_size != 0) {
100	/* Surprise, surprise: We did get some extradata. No idea
101	* if it will work, but just go on and try it, after asking
102	* the user for a sample.
103	*/
104	avpriv_request_sample(s, "Unexpected extradata (%d bytes)",
105	st->codec->extradata_size);
106	} else {
107	st->codec->extradata_size = 6;
108	st->codec->extradata = av_mallocz(6 + FF_INPUT_BUFFER_PADDING_SIZE);
109	if (!st->codec->extradata)
110	return AVERROR(ENOMEM);
111
112	/* setup extradata with our experimentally obtained value */
113	st->codec->extradata[4] = 31;
114	}
115	}
116
117	if (!st->codec->channels) {
118	av_log(s, AV_LOG_WARNING, "Invalid channel count: %d\n",
119	st->codec->channels);
120	return AVERROR_INVALIDDATA;
121	}
122	if (!st->codec->bits_per_coded_sample) {
123	av_log(s, AV_LOG_WARNING, "Invalid bits_per_coded_sample: %d\n",
124	st->codec->bits_per_coded_sample);
125	return AVERROR_INVALIDDATA;
126	}
127
128	/* set the sample rate */
129	avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
130
131	/* parse the remaining RIFF chunks */
132	for (;;) {
133	if (pb->eof_reached) {
134	ret = AVERROR_EOF;
135	goto end;
136	}
137	/* read next chunk tag */
138	tag = avio_rl32(pb);
139	size = avio_rl32(pb);
140	if (tag == MKTAG('d', 'a', 't', 'a')) {
141	/* We assume that the data chunk comes last. */
142	break;
143	} else if (tag == MKTAG('d','p','d','s')) {
144	/* Quoting the MSDN xWMA docs on the dpds chunk: "Contains the
145	* decoded packet cumulative data size array, each element is the
146	* number of bytes accumulated after the corresponding xWMA packet
147	* is decoded in order."
148	*
149	* Each packet has size equal to st->codec->block_align, which in
150	* all cases I saw so far was always 2230. Thus, we can use the
151	* dpds data to compute a seeking index.
152	*/
153
154	/* Error out if there is more than one dpds chunk. */
155	if (dpds_table) {
156	av_log(s, AV_LOG_ERROR, "two dpds chunks present\n");
157	ret = AVERROR_INVALIDDATA;
158	goto end;
159	}
160
161	/* Compute the number of entries in the dpds chunk. */
162	if (size & 3) { /* Size should be divisible by four */
163	av_log(s, AV_LOG_WARNING,
164	"dpds chunk size %"PRId64" not divisible by 4\n", size);
165	}
166	dpds_table_size = size / 4;
167	if (dpds_table_size == 0 \|\| dpds_table_size >= INT_MAX / 4) {
168	av_log(s, AV_LOG_ERROR,
169	"dpds chunk size %"PRId64" invalid\n", size);
170	return AVERROR_INVALIDDATA;
171	}
172
173	/* Allocate some temporary storage to keep the dpds data around.
174	* for processing later on.
175	*/
176	dpds_table = av_malloc(dpds_table_size * sizeof(uint32_t));
177	if (!dpds_table) {
178	return AVERROR(ENOMEM);
179	}
180
181	for (i = 0; i < dpds_table_size; ++i) {
182	dpds_table[i] = avio_rl32(pb);
183	size -= 4;
184	}
185	}
186	avio_skip(pb, size);
187	}
188
189	/* Determine overall data length */
190	if (size < 0) {
191	ret = AVERROR_INVALIDDATA;
192	goto end;
193	}
194	if (!size) {
195	xwma->data_end = INT64_MAX;
196	} else
197	xwma->data_end = avio_tell(pb) + size;
198
199
200	if (dpds_table && dpds_table_size) {
201	int64_t cur_pos;
202	const uint32_t bytes_per_sample
203	= (st->codec->channels * st->codec->bits_per_coded_sample) >> 3;
204
205	/* Estimate the duration from the total number of output bytes. */
206	const uint64_t total_decoded_bytes = dpds_table[dpds_table_size - 1];
207
208	if (!bytes_per_sample) {
209	av_log(s, AV_LOG_ERROR,
210	"Invalid bits_per_coded_sample %d for %d channels\n",
211	st->codec->bits_per_coded_sample, st->codec->channels);
212	ret = AVERROR_INVALIDDATA;
213	goto end;
214	}
215
216	st->duration = total_decoded_bytes / bytes_per_sample;
217
218	/* Use the dpds data to build a seek table. We can only do this after
219	* we know the offset to the data chunk, as we need that to determine
220	* the actual offset to each input block.
221	* Note: If we allowed ourselves to assume that the data chunk always
222	* follows immediately after the dpds block, we could of course guess
223	* the data block's start offset already while reading the dpds chunk.
224	* I decided against that, just in case other chunks ever are
225	* discovered.
226	*/
227	cur_pos = avio_tell(pb);
228	for (i = 0; i < dpds_table_size; ++i) {
229	/* From the number of output bytes that would accumulate in the
230	* output buffer after decoding the first (i+1) packets, we compute
231	* an offset / timestamp pair.
232	*/
233	av_add_index_entry(st,
234	cur_pos + (i+1) * st->codec->block_align, /* pos */
235	dpds_table[i] / bytes_per_sample, /* timestamp */
236	st->codec->block_align, /* size */
237	0, /* duration */
238	AVINDEX_KEYFRAME);
239	}
240	} else if (st->codec->bit_rate) {
241	/* No dpds chunk was present (or only an empty one), so estimate
242	* the total duration using the average bits per sample and the
243	* total data length.
244	*/
245	st->duration = (size<<3) * st->codec->sample_rate / st->codec->bit_rate;
246	}
247
248	end:
249	av_free(dpds_table);
250
251	return ret;
252	}
253
254	static int xwma_read_packet(AVFormatContext s, AVPacket pkt)
255	{
256	int ret, size;
257	int64_t left;
258	AVStream *st;
259	XWMAContext *xwma = s->priv_data;
260
261	st = s->streams[0];
262
263	left = xwma->data_end - avio_tell(s->pb);
264	if (left <= 0) {
265	return AVERROR_EOF;
266	}
267
268	/* read a single block; the default block size is 2230. */
269	size = (st->codec->block_align > 1) ? st->codec->block_align : 2230;
270	size = FFMIN(size, left);
271
272	ret = av_get_packet(s->pb, pkt, size);
273	if (ret < 0)
274	return ret;
275
276	pkt->stream_index = 0;
277	return ret;
278	}
279
280	AVInputFormat ff_xwma_demuxer = {
281	.name = "xwma",
282	.long_name = NULL_IF_CONFIG_SMALL("Microsoft xWMA"),
283	.priv_data_size = sizeof(XWMAContext),
284	.read_probe = xwma_probe,
285	.read_header = xwma_read_header,
286	.read_packet = xwma_read_packet,
287	};