int ff_v4l2_context_init(V4L2Context* ctx)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
struct v4l2_requestbuffers req;
int ret, i;
if (!v4l2_type_supported(ctx)) {
av_log(logger(ctx), AV_LOG_ERROR, "type %i not supported\n", ctx->type);
return AVERROR_PATCHWELCOME;
}
ret = ioctl(s->fd, VIDIOC_G_FMT, &ctx->format);
if (ret)
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_G_FMT failed\n", ctx->name);
memset(&req, 0, sizeof(req));
req.count = ctx->num_buffers;
req.memory = V4L2_MEMORY_MMAP;
req.type = ctx->type;
ret = ioctl(s->fd, VIDIOC_REQBUFS, &req);
if (ret < 0)
return AVERROR(errno);
ctx->num_buffers = req.count;
ctx->buffers = av_mallocz(ctx->num_buffers * sizeof(V4L2Buffer));
if (!ctx->buffers) {
av_log(logger(ctx), AV_LOG_ERROR, "%s malloc enomem\n", ctx->name);
return AVERROR(ENOMEM);
}
for (i = 0; i < req.count; i++) {
ctx->buffers[i].context = ctx;
ret = ff_v4l2_buffer_initialize(&ctx->buffers[i], i);
if (ret < 0) {
av_log(logger(ctx), AV_LOG_ERROR, "%s buffer initialization (%s)\n", ctx->name, av_err2str(ret));
av_free(ctx->buffers);
return ret;
}
}
av_log(logger(ctx), AV_LOG_DEBUG, "%s: %s %02d buffers initialized: %04ux%04u, sizeimage %08u, bytesperline %08u\n", ctx->name,
V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? av_fourcc2str(ctx->format.fmt.pix_mp.pixelformat) : av_fourcc2str(ctx->format.fmt.pix.pixelformat),
req.count,
v4l2_get_width(&ctx->format),
v4l2_get_height(&ctx->format),
V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? ctx->format.fmt.pix_mp.plane_fmt[0].sizeimage : ctx->format.fmt.pix.sizeimage,
V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? ctx->format.fmt.pix_mp.plane_fmt[0].bytesperline : ctx->format.fmt.pix.bytesperline);
return 0;
}
static int wc3_read_header(AVFormatContext *s)
{
Wc3DemuxContext *wc3 = s->priv_data;
AVIOContext *pb = s->pb;
unsigned int fourcc_tag;
unsigned int size;
AVStream *st;
int ret = 0;
char *buffer;
/* default context members */
wc3->width = WC3_DEFAULT_WIDTH;
wc3->height = WC3_DEFAULT_HEIGHT;
wc3->pts = 0;
wc3->video_stream_index = wc3->audio_stream_index = 0;
av_init_packet(&wc3->vpkt);
wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
/* skip the first 3 32-bit numbers */
avio_skip(pb, 12);
/* traverse through the chunks and load the header information before
* the first BRCH tag */
fourcc_tag = avio_rl32(pb);
size = (avio_rb32(pb) + 1) & (~1);
do {
switch (fourcc_tag) {
case SOND_TAG:
case INDX_TAG:
/* SOND unknown, INDX unnecessary; ignore both */
avio_skip(pb, size);
break;
case PC__TAG:
/* number of palettes, unneeded */
avio_skip(pb, 12);
break;
case BNAM_TAG:
/* load up the name */
buffer = av_malloc(size+1);
if (!buffer)
return AVERROR(ENOMEM);
if ((ret = avio_read(pb, buffer, size)) != size)
return AVERROR(EIO);
buffer[size] = 0;
av_dict_set(&s->metadata, "title", buffer,
AV_DICT_DONT_STRDUP_VAL);
break;
case SIZE_TAG:
/* video resolution override */
wc3->width = avio_rl32(pb);
wc3->height = avio_rl32(pb);
break;
case PALT_TAG:
/* one of several palettes */
avio_seek(pb, -8, SEEK_CUR);
av_append_packet(pb, &wc3->vpkt, 8 + PALETTE_SIZE);
break;
default:
av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
av_fourcc2str(fourcc_tag));
return AVERROR_INVALIDDATA;
}
fourcc_tag = avio_rl32(pb);
/* chunk sizes are 16-bit aligned */
size = (avio_rb32(pb) + 1) & (~1);
if (avio_feof(pb))
return AVERROR(EIO);
} while (fourcc_tag != BRCH_TAG);
/* initialize the decoder streams */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);
wc3->video_stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_XAN_WC3;
st->codecpar->codec_tag = 0; /* no fourcc */
st->codecpar->width = wc3->width;
st->codecpar->height = wc3->height;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);
wc3->audio_stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
st->codecpar->codec_tag = 1;
st->codecpar->channels = WC3_AUDIO_CHANNELS;
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS;
st->codecpar->sample_rate = WC3_SAMPLE_RATE;
st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
st->codecpar->bits_per_coded_sample;
st->codecpar->block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS;
return 0;
}
static int xwma_read_header(AVFormatContext *s)
{
int64_t size;
int ret = 0;
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(s, pb, st->codecpar, size, 0);
if (ret < 0)
return ret;
st->need_parsing = AVSTREAM_PARSE_NONE;
/* XWMA encoder only allows a few channel/sample rate/bitrate combinations,
* but some create identical files with fake bitrate (1ch 22050hz at
* 20/48/192kbps are all 20kbps, with the exact same codec data).
* Decoder needs correct bitrate to work, so it's normalized here. */
if (st->codecpar->codec_id == AV_CODEC_ID_WMAV2) {
int ch = st->codecpar->channels;
int sr = st->codecpar->sample_rate;
int br = st->codecpar->bit_rate;
if (ch == 1) {
if (sr == 22050 && (br==48000 || br==192000))
br = 20000;
else if (sr == 32000 && (br==48000 || br==192000))
br = 20000;
else if (sr == 44100 && (br==96000 || br==192000))
br = 48000;
}
else if (ch == 2) {
if (sr == 22050 && (br==48000 || br==192000))
br = 32000;
else if (sr == 32000 && (br==192000))
br = 48000;
}
st->codecpar->bit_rate = br;
}
/* Normally xWMA can only contain WMAv2 with 1/2 channels,
* and WMAPRO with 6 channels. */
if (st->codecpar->codec_id != AV_CODEC_ID_WMAV2 &&
st->codecpar->codec_id != AV_CODEC_ID_WMAPRO) {
avpriv_request_sample(s, "Unexpected codec (tag %s; id %d)",
av_fourcc2str(st->codecpar->codec_tag),
st->codecpar->codec_id);
} else {
/* xWMA shouldn't have extradata. But the WMA codecs require it,
* 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->codecpar->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->codecpar->extradata_size);
} else if (st->codecpar->codec_id == AV_CODEC_ID_WMAPRO) {
if (ff_alloc_extradata(st->codecpar, 18))
return AVERROR(ENOMEM);
memset(st->codecpar->extradata, 0, st->codecpar->extradata_size);
st->codecpar->extradata[ 0] = st->codecpar->bits_per_coded_sample;
st->codecpar->extradata[14] = 224;
} else {
if (ff_alloc_extradata(st->codecpar, 6))
return AVERROR(ENOMEM);
memset(st->codecpar->extradata, 0, st->codecpar->extradata_size);
/* setup extradata with our experimentally obtained value */
st->codecpar->extradata[4] = 31;
}
}
if (!st->codecpar->channels) {
av_log(s, AV_LOG_WARNING, "Invalid channel count: %d\n",
st->codecpar->channels);
return AVERROR_INVALIDDATA;
}
if (!st->codecpar->bits_per_coded_sample) {
av_log(s, AV_LOG_WARNING, "Invalid bits_per_coded_sample: %d\n",
st->codecpar->bits_per_coded_sample);
return AVERROR_INVALIDDATA;
}
/* set the sample rate */
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
/* parse the remaining RIFF chunks */
for (;;) {
if (pb->eof_reached) {
ret = AVERROR_EOF;
goto fail;
}
/* 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->codecpar->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 fail;
}
/* 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_array(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 fail;
}
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->codecpar->channels * st->codecpar->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->codecpar->bits_per_coded_sample, st->codecpar->channels);
ret = AVERROR_INVALIDDATA;
goto fail;
}
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->codecpar->block_align, /* pos */
dpds_table[i] / bytes_per_sample, /* timestamp */
st->codecpar->block_align, /* size */
0, /* duration */
AVINDEX_KEYFRAME);
}
} else if (st->codecpar->bit_rate) {
static int wc3_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
Wc3DemuxContext *wc3 = s->priv_data;
AVIOContext *pb = s->pb;
unsigned int fourcc_tag;
unsigned int size;
int packet_read = 0;
int ret = 0;
unsigned char text[1024];
while (!packet_read) {
fourcc_tag = avio_rl32(pb);
/* chunk sizes are 16-bit aligned */
size = (avio_rb32(pb) + 1) & (~1);
if (avio_feof(pb))
return AVERROR(EIO);
switch (fourcc_tag) {
case BRCH_TAG:
/* no-op */
break;
case SHOT_TAG:
/* load up new palette */
avio_seek(pb, -8, SEEK_CUR);
av_append_packet(pb, &wc3->vpkt, 8 + 4);
break;
case VGA__TAG:
/* send out video chunk */
avio_seek(pb, -8, SEEK_CUR);
ret= av_append_packet(pb, &wc3->vpkt, 8 + size);
// ignore error if we have some data
if (wc3->vpkt.size > 0)
ret = 0;
*pkt = wc3->vpkt;
wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
pkt->stream_index = wc3->video_stream_index;
pkt->pts = wc3->pts;
packet_read = 1;
break;
case TEXT_TAG:
/* subtitle chunk */
if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)
ret = AVERROR(EIO);
else {
int i = 0;
av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");
if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
return AVERROR_INVALIDDATA;
av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]);
i += text[i] + 1;
if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
return AVERROR_INVALIDDATA;
av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]);
i += text[i] + 1;
if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
return AVERROR_INVALIDDATA;
av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]);
}
break;
case AUDI_TAG:
/* send out audio chunk */
ret= av_get_packet(pb, pkt, size);
pkt->stream_index = wc3->audio_stream_index;
pkt->pts = wc3->pts;
/* time to advance pts */
wc3->pts++;
packet_read = 1;
break;
default:
av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
av_fourcc2str(fourcc_tag));
ret = AVERROR_INVALIDDATA;
packet_read = 1;
break;
}
}
return ret;
}
static int apng_read_packet(AVFormatContext *s, AVPacket *pkt)
{
APNGDemuxContext *ctx = s->priv_data;
int64_t ret;
int64_t size;
AVIOContext *pb = s->pb;
uint32_t len, tag;
/*
* fcTL chunk length, in bytes:
* 4 (length)
* 4 (tag)
* 26 (actual chunk)
* 4 (crc) bytes
* and needed next:
* 4 (length)
* 4 (tag (must be fdAT or IDAT))
*/
/* if num_play is not 1, then the seekback is already guaranteed */
if (ctx->num_play == 1 && (ret = ffio_ensure_seekback(pb, 46)) < 0)
return ret;
len = avio_rb32(pb);
tag = avio_rl32(pb);
if (avio_feof(pb))
return AVERROR_EOF;
switch (tag) {
case MKTAG('f', 'c', 'T', 'L'):
if (len != 26)
return AVERROR_INVALIDDATA;
if ((ret = decode_fctl_chunk(s, ctx, pkt)) < 0)
return ret;
/* fcTL must precede fdAT or IDAT */
len = avio_rb32(pb);
tag = avio_rl32(pb);
if (len > 0x7fffffff ||
tag != MKTAG('f', 'd', 'A', 'T') &&
tag != MKTAG('I', 'D', 'A', 'T'))
return AVERROR_INVALIDDATA;
size = 38 /* fcTL */ + 8 /* len, tag */ + len + 4 /* crc */;
if (size > INT_MAX)
return AVERROR(EINVAL);
if ((ret = avio_seek(pb, -46, SEEK_CUR)) < 0 ||
(ret = av_append_packet(pb, pkt, size)) < 0)
return ret;
if (ctx->num_play == 1 && (ret = ffio_ensure_seekback(pb, 8)) < 0)
return ret;
len = avio_rb32(pb);
tag = avio_rl32(pb);
while (tag &&
tag != MKTAG('f', 'c', 'T', 'L') &&
tag != MKTAG('I', 'E', 'N', 'D')) {
if (len > 0x7fffffff)
return AVERROR_INVALIDDATA;
if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0 ||
(ret = av_append_packet(pb, pkt, len + 12)) < 0)
return ret;
if (ctx->num_play == 1 && (ret = ffio_ensure_seekback(pb, 8)) < 0)
return ret;
len = avio_rb32(pb);
tag = avio_rl32(pb);
}
if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0)
return ret;
if (ctx->is_key_frame)
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->pts = pkt->dts = AV_NOPTS_VALUE;
pkt->duration = ctx->pkt_duration;
return ret;
case MKTAG('I', 'E', 'N', 'D'):
ctx->cur_loop++;
if (ctx->ignore_loop || ctx->num_play >= 1 && ctx->cur_loop == ctx->num_play) {
avio_seek(pb, -8, SEEK_CUR);
return AVERROR_EOF;
}
if ((ret = avio_seek(pb, s->streams[0]->codecpar->extradata_size + 8, SEEK_SET)) < 0)
return ret;
return 0;
default:
avpriv_request_sample(s, "In-stream tag=%s (0x%08"PRIX32") len=%"PRIu32,
av_fourcc2str(tag), tag, len);
avio_skip(pb, len + 4);
}
/* Handle the unsupported yet cases */
return AVERROR_PATCHWELCOME;
}
