static int decode_nal_sei_message(HEVCContext *s)
{
GetBitContext *gb = &s->HEVClc->gb;
int payload_type = 0;
int payload_size = 0;
int byte = 0xFF;
av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
while (byte == 0xFF) {
if (get_bits_left(gb) < 16 || payload_type > INT_MAX - 255)
return AVERROR_INVALIDDATA;
byte = get_bits(gb, 8);
payload_type += byte;
}
byte = 0xFF;
while (byte == 0xFF) {
if (get_bits_left(gb) < 8 + 8LL*payload_size)
return AVERROR_INVALIDDATA;
byte = get_bits(gb, 8);
payload_size += byte;
}
if (s->nal_unit_type == NAL_SEI_PREFIX) {
return decode_nal_sei_prefix(s, payload_type, payload_size);
} else { /* nal_unit_type == NAL_SEI_SUFFIX */
return decode_nal_sei_suffix(s, payload_type, payload_size);
}
return 1;
}
static int read_audio_mux_element(struct LATMContext *latmctx,
GetBitContext *gb)
{
int err;
uint8_t use_same_mux = get_bits(gb, 1);
if (!use_same_mux) {
if ((err = read_stream_mux_config(latmctx, gb)) < 0)
return err;
} else if (!latmctx->aac_ctx.avctx->extradata) {
av_log(latmctx->aac_ctx.avctx, AV_LOG_DEBUG,
"no decoder config found\n");
return AVERROR(EAGAIN);
}
if (latmctx->audio_mux_version_A == 0) {
int mux_slot_length_bytes = read_payload_length_info(latmctx, gb);
if (mux_slot_length_bytes * 8 > get_bits_left(gb)) {
av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR, "incomplete frame\n");
return AVERROR_INVALIDDATA;
} else if (mux_slot_length_bytes * 8 + 256 < get_bits_left(gb)) {
av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR,
"frame length mismatch %d << %d\n",
mux_slot_length_bytes * 8, get_bits_left(gb));
return AVERROR_INVALIDDATA;
}
}
return 0;
}
static int latm_decode_audio_specific_config(struct LATMContext *latmctx,
GetBitContext *gb, int asclen)
{
AACContext *ac = &latmctx->aac_ctx;
AVCodecContext *avctx = ac->avctx;
MPEG4AudioConfig m4ac = { 0 };
int config_start_bit = get_bits_count(gb);
int sync_extension = 0;
int bits_consumed, esize;
if (asclen) {
sync_extension = 1;
asclen = FFMIN(asclen, get_bits_left(gb));
} else
asclen = get_bits_left(gb);
if (config_start_bit % 8) {
avpriv_request_sample(latmctx->aac_ctx.avctx,
"Non-byte-aligned audio-specific config");
return AVERROR_PATCHWELCOME;
}
if (asclen <= 0)
return AVERROR_INVALIDDATA;
bits_consumed = decode_audio_specific_config(NULL, avctx, &m4ac,
gb->buffer + (config_start_bit / 8),
asclen, sync_extension);
if (bits_consumed < 0)
return AVERROR_INVALIDDATA;
if (!latmctx->initialized ||
ac->oc[1].m4ac.sample_rate != m4ac.sample_rate ||
ac->oc[1].m4ac.chan_config != m4ac.chan_config) {
if(latmctx->initialized) {
av_log(avctx, AV_LOG_INFO, "audio config changed\n");
} else {
av_log(avctx, AV_LOG_DEBUG, "initializing latmctx\n");
}
latmctx->initialized = 0;
esize = (bits_consumed+7) / 8;
if (avctx->extradata_size < esize) {
av_free(avctx->extradata);
avctx->extradata = av_malloc(esize + AV_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata)
return AVERROR(ENOMEM);
}
avctx->extradata_size = esize;
memcpy(avctx->extradata, gb->buffer + (config_start_bit/8), esize);
memset(avctx->extradata+esize, 0, AV_INPUT_BUFFER_PADDING_SIZE);
}
skip_bits_long(gb, bits_consumed);
return bits_consumed;
}
int ff_h264_decode_sei(H264Context *h){
while (get_bits_left(&h->gb) > 16) {
int size, type;
type=0;
do{
if (get_bits_left(&h->gb) < 8)
return -1;
type+= show_bits(&h->gb, 8);
}while(get_bits(&h->gb, 8) == 255);
size=0;
do{
if (get_bits_left(&h->gb) < 8)
return -1;
size+= show_bits(&h->gb, 8);
}while(get_bits(&h->gb, 8) == 255);
if(h->avctx->debug&FF_DEBUG_STARTCODE)
av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
switch(type){
case SEI_TYPE_PIC_TIMING: // Picture timing SEI
if(decode_picture_timing(h) < 0)
return -1;
break;
case SEI_TYPE_USER_DATA_ITU_T_T35:
if(decode_user_data_itu_t_t35(h, size) < 0)
return -1;
break;
case SEI_TYPE_USER_DATA_UNREGISTERED:
if(decode_unregistered_user_data(h, size) < 0)
return -1;
break;
case SEI_TYPE_RECOVERY_POINT:
if(decode_recovery_point(h) < 0)
return -1;
break;
case SEI_BUFFERING_PERIOD:
if(decode_buffering_period(h) < 0)
return -1;
break;
case SEI_TYPE_FRAME_PACKING:
if(decode_frame_packing(h, size) < 0)
return -1;
default:
skip_bits(&h->gb, 8*size);
}
//FIXME check bits here
align_get_bits(&h->gb);
}
return 0;
}
static int parse_mb_skip(Wmv2Context *w)
{
int mb_x, mb_y;
MpegEncContext *const s = &w->s;
uint32_t *const mb_type = s->current_picture_ptr->mb_type;
w->skip_type = get_bits(&s->gb, 2);
switch (w->skip_type) {
case SKIP_TYPE_NONE:
for (mb_y = 0; mb_y < s->mb_height; mb_y++)
for (mb_x = 0; mb_x < s->mb_width; mb_x++)
mb_type[mb_y * s->mb_stride + mb_x] =
MB_TYPE_16x16 | MB_TYPE_L0;
break;
case SKIP_TYPE_MPEG:
if (get_bits_left(&s->gb) < s->mb_height * s->mb_width)
return AVERROR_INVALIDDATA;
for (mb_y = 0; mb_y < s->mb_height; mb_y++)
for (mb_x = 0; mb_x < s->mb_width; mb_x++)
mb_type[mb_y * s->mb_stride + mb_x] =
(get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
break;
case SKIP_TYPE_ROW:
for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
if (get_bits_left(&s->gb) < 1)
return AVERROR_INVALIDDATA;
if (get_bits1(&s->gb)) {
for (mb_x = 0; mb_x < s->mb_width; mb_x++)
mb_type[mb_y * s->mb_stride + mb_x] =
MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
} else {
for (mb_x = 0; mb_x < s->mb_width; mb_x++)
mb_type[mb_y * s->mb_stride + mb_x] =
(get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
}
}
break;
case SKIP_TYPE_COL:
for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
if (get_bits_left(&s->gb) < 1)
return AVERROR_INVALIDDATA;
if (get_bits1(&s->gb)) {
for (mb_y = 0; mb_y < s->mb_height; mb_y++)
mb_type[mb_y * s->mb_stride + mb_x] =
MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
} else {
for (mb_y = 0; mb_y < s->mb_height; mb_y++)
mb_type[mb_y * s->mb_stride + mb_x] =
(get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
}
}
break;
}
return 0;
}
int ff_h264_decode_sei(H264Context *h)
{
while (get_bits_left(&h->gb) > 16) {
int size = 0;
int type = 0;
int ret = 0;
do
type += show_bits(&h->gb, 8);
while (get_bits(&h->gb, 8) == 255);
do
size += show_bits(&h->gb, 8);
while (get_bits(&h->gb, 8) == 255);
if (size > get_bits_left(&h->gb) / 8) {
av_log(h->avctx, AV_LOG_ERROR, "SEI type %d truncated at %d\n",
type, get_bits_left(&h->gb));
return AVERROR_INVALIDDATA;
}
switch (type) {
case SEI_TYPE_PIC_TIMING: // Picture timing SEI
ret = decode_picture_timing(h);
if (ret < 0)
return ret;
break;
case SEI_TYPE_USER_DATA_UNREGISTERED:
ret = decode_unregistered_user_data(h, size);
if (ret < 0)
return ret;
break;
case SEI_TYPE_RECOVERY_POINT:
ret = decode_recovery_point(h);
if (ret < 0)
return ret;
break;
case SEI_BUFFERING_PERIOD:
ret = decode_buffering_period(h);
if (ret < 0)
return ret;
break;
default:
av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
skip_bits(&h->gb, 8 * size);
}
// FIXME check bits here
align_get_bits(&h->gb);
}
return 0;
}
void ff_dirac_init_arith_decoder(DiracArith *c, GetBitContext *gb, int length)
{
int i;
align_get_bits(gb);
length = FFMIN(length, get_bits_left(gb)/8);
c->bytestream = gb->buffer + get_bits_count(gb)/8;
c->bytestream_end = c->bytestream + length;
skip_bits_long(gb, length*8);
c->low = 0;
for (i = 0; i < 4; i++) {
c->low <<= 8;
if (c->bytestream < c->bytestream_end)
c->low |= *c->bytestream++;
else
c->low |= 0xff;
}
c->counter = -16;
c->range = 0xffff;
for (i = 0; i < 256; i++) {
ff_dirac_prob_branchless[i][0] = ff_dirac_prob[255-i];
ff_dirac_prob_branchless[i][1] = -ff_dirac_prob[i];
}
for (i = 0; i < DIRAC_CTX_COUNT; i++)
c->contexts[i] = 0x8000;
}
void ff_hevc_cabac_init(HEVCContext *s)
{
int i;
int init_type;
GetBitContext *gb = &s->gb;
align_get_bits(gb);
ff_init_cabac_states(&s->cc);
ff_init_cabac_decoder(&s->cc,
gb->buffer + get_bits_count(gb) / 8,
(get_bits_left(&s->gb) + 7) / 8);
init_type = 2 - s->sh.slice_type;
if (s->sh.cabac_init_flag && s->sh.slice_type != I_SLICE)
init_type ^= 3;
elem_offset[0] = 0;
for (i = 1; i < sizeof(num_bins_in_se); i++) {
elem_offset[i] = elem_offset[i-1] + num_bins_in_se[i-1];
}
for (i = 0; i < HEVC_CONTEXTS; i++) {
int init_value = init_values[init_type][i];
int m = (init_value >> 4)*5 - 45;
int n = ((init_value & 15) << 3) - 16;
int pre_ctx_state = av_clip_c(((m * av_clip_c(s->sh.slice_qp, 0, 51)) >> 4) + n,
1, 126);
int mps = (pre_ctx_state <= 63) ? 0 : 1;
int state_idx = mps ? (pre_ctx_state - 64) : (63 - pre_ctx_state);
s->cabac_state[i] = (state_idx << 1) + mps;
}
}
static int FUNC(user_data)(CodedBitstreamContext *ctx, RWContext *rw,
MPEG2RawUserData *current)
{
size_t k;
int err;
HEADER("User Data");
ui(8, user_data_start_code);
#ifdef READ
k = get_bits_left(rw);
av_assert0(k % 8 == 0);
current->user_data_length = k /= 8;
if (k > 0) {
current->user_data_ref = av_buffer_alloc(k);
if (!current->user_data_ref)
return AVERROR(ENOMEM);
current->user_data = current->user_data_ref->data;
}
#endif
for (k = 0; k < current->user_data_length; k++)
xui(8, user_data, current->user_data[k], 0);
return 0;
}
static int decode_skip_count(GetBitContext* gb)
{
int value;
if (get_bits_left(gb) < 1+3)
return -1;
value = get_bits1(gb);
if (value)
return 0;
value = get_bits(gb, 3);
if (value)
return value;
value = get_bits(gb, 8);
if (value)
return value + 7;
value = get_bits(gb, 15);
if (value)
return value + 262;
return -1;
}
static int cbs_vp9_read_s(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name,
const int *subscripts, int32_t *write_to)
{
uint32_t magnitude;
int position, sign;
int32_t value;
if (ctx->trace_enable)
position = get_bits_count(gbc);
if (get_bits_left(gbc) < width + 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid signed value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
magnitude = get_bits(gbc, width);
sign = get_bits1(gbc);
value = sign ? -(int32_t)magnitude : magnitude;
if (ctx->trace_enable) {
char bits[33];
int i;
for (i = 0; i < width; i++)
bits[i] = magnitude >> (width - i - 1) & 1 ? '1' : '0';
bits[i] = sign ? '1' : '0';
bits[i + 1] = 0;
ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
bits, value);
}
int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name,
const int *subscripts, uint32_t *write_to,
uint32_t range_min, uint32_t range_max)
{
uint32_t value;
int position;
av_assert0(width > 0 && width <= 32);
if (get_bits_left(gbc) < width) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
if (ctx->trace_enable)
position = get_bits_count(gbc);
value = get_bits_long(gbc, width);
if (ctx->trace_enable) {
char bits[33];
int i;
for (i = 0; i < width; i++)
bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
bits[i] = 0;
ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
bits, value);
}
size_t CByteParser::RemainingBits() const
{
int bits = get_bits_left(m_gbCtx);
if (bits < 0)
return 0;
return (size_t)bits;
}
static CodeBook unpack_codebook(GetBitContext* gb, unsigned depth,
unsigned size)
{
unsigned i, j;
CodeBook cb = { 0 };
if (size >= INT_MAX / 34 || get_bits_left(gb) < size * 34)
return cb;
if (size >= INT_MAX / sizeof(MacroBlock))
return cb;
cb.blocks = av_malloc(size ? size * sizeof(MacroBlock) : 1);
if (!cb.blocks)
return cb;
cb.depth = depth;
cb.size = size;
for (i = 0; i < size; i++) {
unsigned mask_bits = get_bits(gb, 4);
unsigned color0 = get_bits(gb, 15);
unsigned color1 = get_bits(gb, 15);
for (j = 0; j < 4; j++) {
if (mask_bits & (1 << j))
cb.blocks[i].pixels[j] = color1;
else
cb.blocks[i].pixels[j] = color0;
}
}
return cb;
}
static unsigned decode_skip_count(GetBitContext* gb) {
unsigned value;
// This function reads a maximum of 27 bits,
// which is within the padding space
if (get_bits_left(gb) < 1+3)
return -1;
value = get_bits1(gb);
if (value)
return 0;
value = get_bits(gb, 3);
if (value)
return value;
value = get_bits(gb, 8);
if (value)
return value + 7;
value = get_bits(gb, 15);
if (value)
return value + 262;
return -1;
}
static int atrac3p_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
ATRAC3PContext *ctx = avctx->priv_data;
AVFrame *frame = data;
int i, ret, ch_unit_id, ch_block = 0, out_ch_index = 0, channels_to_process;
float **samples_p = (float **)frame->extended_data;
frame->nb_samples = ATRAC3P_FRAME_SAMPLES;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
if ((ret = init_get_bits8(&ctx->gb, avpkt->data, avpkt->size)) < 0)
return ret;
if (get_bits1(&ctx->gb)) {
av_log(avctx, AV_LOG_ERROR, "Invalid start bit!\n");
return AVERROR_INVALIDDATA;
}
while (get_bits_left(&ctx->gb) >= 2 &&
(ch_unit_id = get_bits(&ctx->gb, 2)) != CH_UNIT_TERMINATOR) {
if (ch_unit_id == CH_UNIT_EXTENSION) {
avpriv_report_missing_feature(avctx, "Channel unit extension");
return AVERROR_PATCHWELCOME;
}
if (ch_block >= ctx->num_channel_blocks ||
ctx->channel_blocks[ch_block] != ch_unit_id) {
av_log(avctx, AV_LOG_ERROR,
"Frame data doesn't match channel configuration!\n");
return AVERROR_INVALIDDATA;
}
ctx->ch_units[ch_block].unit_type = ch_unit_id;
channels_to_process = ch_unit_id + 1;
if ((ret = ff_atrac3p_decode_channel_unit(&ctx->gb,
&ctx->ch_units[ch_block],
channels_to_process,
avctx)) < 0)
return ret;
decode_residual_spectrum(&ctx->ch_units[ch_block], ctx->samples,
channels_to_process, avctx);
reconstruct_frame(ctx, &ctx->ch_units[ch_block],
channels_to_process, avctx);
for (i = 0; i < channels_to_process; i++)
memcpy(samples_p[out_ch_index + i], ctx->outp_buf[i],
ATRAC3P_FRAME_SAMPLES * sizeof(**samples_p));
ch_block++;
out_ch_index += channels_to_process;
}
*got_frame_ptr = 1;
return FFMIN(avctx->block_align, avpkt->size);
}
static void cabac_init_decoder(HEVCContext *s)
{
GetBitContext *gb = &s->HEVClc.gb;
skip_bits(gb, 1);
align_get_bits(gb);
ff_init_cabac_decoder(&s->HEVClc.cc,
gb->buffer + get_bits_count(gb) / 8,
(get_bits_left(gb) + 7) / 8);
}
void ff_hevc_cabac_reinit(HEVCContext *s)
{
int n;
GetBitContext *gb = &s->gb;
n = -get_bits_count(gb) & 7;
if (n) skip_bits(gb, n);
ff_init_cabac_decoder(&s->cc,
gb->buffer + get_bits_count(gb) / 8,
(get_bits_left(&s->gb) + 7) / 8);
}
static int cbs_read_se_golomb(CodedBitstreamContext *ctx, GetBitContext *gbc,
const char *name, int32_t *write_to,
int32_t range_min, int32_t range_max)
{
int32_t value;
int position, i, j;
unsigned int k;
uint32_t v;
char bits[65];
position = get_bits_count(gbc);
for (i = 0; i < 32; i++) {
if (get_bits_left(gbc) < i + 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid se-golomb code at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
k = get_bits1(gbc);
bits[i] = k ? '1' : '0';
if (k)
break;
}
if (i >= 32) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid se-golomb code at "
"%s: more than 31 zeroes.\n", name);
return AVERROR_INVALIDDATA;
}
v = 1;
for (j = 0; j < i; j++) {
k = get_bits1(gbc);
bits[i + j + 1] = k ? '1' : '0';
v = v << 1 | k;
}
bits[i + j + 1] = 0;
if (v & 1)
value = -(int32_t)(v / 2);
else
value = v / 2;
if (ctx->trace_enable)
ff_cbs_trace_syntax_element(ctx, position, name, bits, value);
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
*write_to = value;
return 0;
}
/**
* Decode the group of blocks header or slice header.
* @return <0 if an error occurred
*/
static int h263_decode_gob_header(MpegEncContext *s)
{
unsigned int val, gob_number;
int left;
/* Check for GOB Start Code */
val = show_bits(&s->gb, 16);
if(val)
return -1;
/* We have a GBSC probably with GSTUFF */
skip_bits(&s->gb, 16); /* Drop the zeros */
left= get_bits_left(&s->gb);
left = FFMIN(left, 32);
//MN: we must check the bits left or we might end in a infinite loop (or segfault)
for(;left>13; left--){
if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
}
if(left<=13)
return -1;
if(s->h263_slice_structured){
if(check_marker(&s->gb, "before MBA")==0)
return -1;
ff_h263_decode_mba(s);
if(s->mb_num > 1583)
if(check_marker(&s->gb, "after MBA")==0)
return -1;
s->qscale = get_bits(&s->gb, 5); /* SQUANT */
if(check_marker(&s->gb, "after SQUANT")==0)
return -1;
skip_bits(&s->gb, 2); /* GFID */
}else{
gob_number = get_bits(&s->gb, 5); /* GN */
s->mb_x= 0;
s->mb_y= s->gob_index* gob_number;
skip_bits(&s->gb, 2); /* GFID */
s->qscale = get_bits(&s->gb, 5); /* GQUANT */
}
if(s->mb_y >= s->mb_height)
return -1;
if(s->qscale==0)
return -1;
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
BinkAudioContext *s = avctx->priv_data;
AVFrame *frame = data;
GetBitContext *gb = &s->gb;
int ret, consumed = 0;
if (!get_bits_left(gb)) {
uint8_t *buf;
/* handle end-of-stream */
if (!avpkt->size) {
*got_frame_ptr = 0;
return 0;
}
if (avpkt->size < 4) {
av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
return AVERROR_INVALIDDATA;
}
buf = av_realloc(s->packet_buffer, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!buf)
return AVERROR(ENOMEM);
s->packet_buffer = buf;
memcpy(s->packet_buffer, avpkt->data, avpkt->size);
init_get_bits(gb, s->packet_buffer, avpkt->size * 8);
consumed = avpkt->size;
/* skip reported size */
skip_bits_long(gb, 32);
}
/* get output buffer */
frame->nb_samples = s->frame_len;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
if (decode_block(s, (float **)frame->extended_data,
avctx->codec->id == AV_CODEC_ID_BINKAUDIO_DCT)) {
av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n");
return AVERROR_INVALIDDATA;
}
get_bits_align32(gb);
frame->nb_samples = s->block_size / avctx->channels;
*got_frame_ptr = 1;
return consumed;
}
static int decode_frame_packing(H264Context *h, int size) {
int bits = get_bits_left(&h->gb);
h->sei_fpa.frame_packing_arrangement_id = get_ue_golomb(&h->gb);
h->sei_fpa.frame_packing_arrangement_cancel_flag = get_bits(&h->gb, 1);
if (!h->sei_fpa.frame_packing_arrangement_cancel_flag) {
h->sei_fpa.frame_packing_arrangement_type = get_bits(&h->gb, 7);
h->sei_fpa.quincunx_sampling_flag = get_bits(&h->gb, 1);
h->sei_fpa.content_interpretation_type = get_bits(&h->gb, 6);
skip_bits(&h->gb, 1); /* spatial_flipping_flag */
skip_bits(&h->gb, 1); /* frame0_flipped_flag */
skip_bits(&h->gb, 1); /* field_views_flag */
skip_bits(&h->gb, 1); /* current_frame_is_frame0_flag */
skip_bits(&h->gb, 1); /* frame0_self_contained_flag */
skip_bits(&h->gb, 1); /* frame1_self_contained_flag */
if (!h->sei_fpa.quincunx_sampling_flag && h->sei_fpa.frame_packing_arrangement_type != 5) {
skip_bits(&h->gb, 4); /* frame0_grid_position_x */
skip_bits(&h->gb, 4); /* frame0_grid_position_y */
skip_bits(&h->gb, 4); /* frame1_grid_position_x */
skip_bits(&h->gb, 4); /* frame1_grid_position_y */
}
skip_bits(&h->gb, 8); /* frame_packing_arrangement_reserved_byte */
h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
}
skip_bits(&h->gb, 1); /* frame_packing_arrangement_extension_flag */
if (h->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
h->sei_fpa.frame_packing_arrangement_id,
h->sei_fpa.frame_packing_arrangement_cancel_flag,
h->sei_fpa.frame_packing_arrangement_type,
h->sei_fpa.quincunx_sampling_flag,
h->sei_fpa.content_interpretation_type,
h->sei_fpa.frame_packing_arrangement_repetition_period);
skip_bits_long(&h->gb, 8 * size - (bits - get_bits_left(&h->gb)));
return 0;
}
/**
* Fill the gain array for the timedomain quantization.
*
* @param gb pointer to the GetBitContext
* @param gaininfo array[9] of gain indexes
*/
static void decode_gain_info(GetBitContext *gb, int *gaininfo)
{
int i, n;
n = get_unary(gb, 0, get_bits_left(gb)); // amount of elements*2 to update
i = 0;
while (n--) {
int index = get_bits(gb, 3);
int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1;
while (i <= index)
gaininfo[i++] = gain;
}
while (i <= 8)
gaininfo[i++] = 0;
}
int ff_h264_decode_sei(H264Context *h)
{
while (get_bits_left(&h->gb) > 16) {
int size = 0;
int type = 0;
int ret = 0;
do
type += show_bits(&h->gb, 8);
while (get_bits(&h->gb, 8) == 255);
do
size += show_bits(&h->gb, 8);
while (get_bits(&h->gb, 8) == 255);
switch (type) {
case SEI_TYPE_PIC_TIMING: // Picture timing SEI
ret = decode_picture_timing(h);
if (ret < 0)
return ret;
break;
case SEI_TYPE_USER_DATA_UNREGISTERED:
ret = decode_unregistered_user_data(h, size);
if (ret < 0)
return ret;
break;
case SEI_TYPE_RECOVERY_POINT:
ret = decode_recovery_point(h);
if (ret < 0)
return ret;
break;
case SEI_BUFFERING_PERIOD:
ret = decode_buffering_period(h);
if (ret < 0)
return ret;
break;
default:
skip_bits(&h->gb, 8 * size);
}
// FIXME check bits here
align_get_bits(&h->gb);
}
return 0;
}
static int read_len_table(uint8_t *dst, GetBitContext *gb, int n)
{
int i, val, repeat;
for (i = 0; i < n;) {
repeat = get_bits(gb, 3);
val = get_bits(gb, 5);
if (repeat == 0)
repeat = get_bits(gb, 8);
if (i + repeat > n || get_bits_left(gb) < 0) {
av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
return AVERROR_INVALIDDATA;
}
while (repeat--)
dst[i++] = val;
}
return 0;
}
static int read_len_table(uint8_t *dst, GetBitContext *gb){
int i, val, repeat;
for(i=0; i<256;){
repeat= get_bits(gb, 3);
val = get_bits(gb, 5);
if(repeat==0)
repeat= get_bits(gb, 8);
//printf("%d %d\n", val, repeat);
if(i+repeat > 256 || get_bits_left(gb) < 0) {
av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
return -1;
}
while (repeat--)
dst[i++] = val;
}
return 0;
}
static int parse_fmtp_config(AVStream *st, char *value)
{
int len = ff_hex_to_data(NULL, value), i, ret = 0;
GetBitContext gb;
uint8_t *config;
int audio_mux_version, same_time_framing, num_sub_frames,
num_programs, num_layers;
/* Pad this buffer, too, to avoid out of bounds reads with get_bits below */
config = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
if (!config)
return AVERROR(ENOMEM);
ff_hex_to_data(config, value);
init_get_bits(&gb, config, len*8);
audio_mux_version = get_bits(&gb, 1);
same_time_framing = get_bits(&gb, 1);
num_sub_frames = get_bits(&gb, 6);
num_programs = get_bits(&gb, 4);
num_layers = get_bits(&gb, 3);
if (audio_mux_version != 0 || same_time_framing != 1 || num_programs != 0 ||
num_layers != 0)
{
av_log(NULL, AV_LOG_WARNING, "Unsupported LATM config (%d,%d,%d,%d)\n",
audio_mux_version, same_time_framing,
num_programs, num_layers);
ret = AVERROR_PATCHWELCOME;
goto end;
}
av_freep(&st->codec->extradata);
st->codec->extradata_size = (get_bits_left(&gb) + 7)/8;
st->codec->extradata = av_mallocz(st->codec->extradata_size +
FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
{
ret = AVERROR(ENOMEM);
goto end;
}
for (i = 0; i < st->codec->extradata_size; i++)
st->codec->extradata[i] = get_bits(&gb, 8);
end:
av_free(config);
return ret;
}
/**
* decodes the group of blocks / video packet header.
* @return <0 if no resync found
*/
static int ff_h261_resync(H261Context *h)
{
MpegEncContext * const s = &h->s;
int left, ret;
if ( h->gob_start_code_skipped )
{
ret= h261_decode_gob_header(h);
if(ret>=0)
return 0;
}
else
{
if(show_bits(&s->gb, 15)==0)
{
ret= h261_decode_gob_header(h);
if(ret>=0)
return 0;
}
//OK, it is not where it is supposed to be ...
s->gb= s->last_resync_gb;
align_get_bits(&s->gb);
left= get_bits_left(&s->gb);
for(; left>15+1+4+5; left-=8)
{
if(show_bits(&s->gb, 15)==0)
{
GetBitContext bak= s->gb;
ret= h261_decode_gob_header(h);
if(ret>=0)
return 0;
s->gb= bak;
}
skip_bits(&s->gb, 8);
}
}
return -1;
}
/**
* Decode the group of blocks / video packet header.
* @return bit position of the resync_marker, or <0 if none was found
*/
int ff_h263_resync(MpegEncContext *s){
int left, pos, ret;
if(s->codec_id==AV_CODEC_ID_MPEG4){
skip_bits1(&s->gb);
align_get_bits(&s->gb);
}
if(show_bits(&s->gb, 16)==0){
pos= get_bits_count(&s->gb);
if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
else
ret= h263_decode_gob_header(s);
if(ret>=0)
return pos;
}
//OK, it's not where it is supposed to be ...
s->gb= s->last_resync_gb;
align_get_bits(&s->gb);
left= get_bits_left(&s->gb);
for(;left>16+1+5+5; left-=8){
if(show_bits(&s->gb, 16)==0){
GetBitContext bak= s->gb;
pos= get_bits_count(&s->gb);
if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
else
ret= h263_decode_gob_header(s);
if(ret>=0)
return pos;
s->gb= bak;
}
skip_bits(&s->gb, 8);
}
return -1;
}
/**
* Parse MPEG-4 audio configuration for ALS object type.
* @param[in] gb bit reader context
* @param[in] c MPEG4AudioConfig structure to fill
* @return on success 0 is returned, otherwise a value < 0
*/
static int parse_config_ALS(GetBitContext *gb, MPEG4AudioConfig *c)
{
if (get_bits_left(gb) < 112)
return -1;
if (get_bits_long(gb, 32) != MKBETAG('A','L','S','\0'))
return -1;
// override AudioSpecificConfig channel configuration and sample rate
// which are buggy in old ALS conformance files
c->sample_rate = get_bits_long(gb, 32);
// skip number of samples
skip_bits_long(gb, 32);
// read number of channels
c->chan_config = 0;
c->channels = get_bits(gb, 16) + 1;
return 0;
}
