On Fri, Mar 18, 2022 at 04:21:44PM +0100, Paul B Mahol wrote: > On 3/18/22, Andreas Rheinhardt <[email protected]> wrote: > > Paul B Mahol: > >> As presented in .binka files. > >> > >> Signed-off-by: Paul B Mahol <[email protected]> > >> --- > >> libavcodec/binkaudio.c | 50 +++++++++++++++++++++++++++--------------- > >> 1 file changed, 32 insertions(+), 18 deletions(-) > >> > >> diff --git a/libavcodec/binkaudio.c b/libavcodec/binkaudio.c > >> index b4ff15beeb..54b7e22854 100644 > >> --- a/libavcodec/binkaudio.c > >> +++ b/libavcodec/binkaudio.c > >> @@ -51,13 +51,14 @@ typedef struct BinkAudioContext { > >> int version_b; ///< Bink version 'b' > >> int first; > >> int channels; > >> + int ch_offset; > >> int frame_len; ///< transform size (samples) > >> int overlap_len; ///< overlap size (samples) > >> int block_size; > >> int num_bands; > >> float root; > >> unsigned int bands[26]; > >> - float previous[MAX_CHANNELS][BINK_BLOCK_MAX_SIZE / 16]; ///< coeffs > >> from previous audio block > >> + float previous[6][BINK_BLOCK_MAX_SIZE / 16]; ///< coeffs from > >> previous audio block > >> float quant_table[96]; > >> AVPacket *pkt; > >> union { > >> @@ -74,6 +75,7 @@ static av_cold int decode_init(AVCodecContext *avctx) > >> int sample_rate_half; > >> int i, ret; > >> int frame_len_bits; > >> + int max_channels = avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT ? > >> MAX_CHANNELS : 6; > > > > If you allow up to six channels, then MAX_CHANNELS (i.e. two) needs to > > be renamed. > > > >> int channels = avctx->ch_layout.nb_channels; > >> > >> /* determine frame length */ > >> @@ -85,7 +87,7 @@ static av_cold int decode_init(AVCodecContext *avctx) > >> frame_len_bits = 11; > >> } > >> > >> - if (channels < 1 || channels > MAX_CHANNELS) { > >> + if (channels < 1 || channels > max_channels) { > >> av_log(avctx, AV_LOG_ERROR, "invalid number of channels: %d\n", > >> channels); > >> return AVERROR_INVALIDDATA; > >> } > >> @@ -110,7 +112,7 @@ static av_cold int decode_init(AVCodecContext *avctx) > >> > >> s->frame_len = 1 << frame_len_bits; > >> s->overlap_len = s->frame_len / 16; > >> - s->block_size = (s->frame_len - s->overlap_len) * s->channels; > >> + s->block_size = (s->frame_len - s->overlap_len) * > >> FFMIN(MAX_CHANNELS, s->channels); > >> sample_rate_half = (sample_rate + 1LL) / 2; > >> if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) > >> s->root = 2.0 / (sqrt(s->frame_len) * 32768.0); > >> @@ -166,7 +168,8 @@ static const uint8_t rle_length_tab[16] = { > >> * @param[out] out Output buffer (must contain s->block_size elements) > >> * @return 0 on success, negative error code on failure > >> */ > >> -static int decode_block(BinkAudioContext *s, float **out, int use_dct) > >> +static int decode_block(BinkAudioContext *s, float **out, int use_dct, > >> + int channels, int ch_offset) > >> { > >> int ch, i, j, k; > >> float q, quant[25]; > >> @@ -176,8 +179,8 @@ static int decode_block(BinkAudioContext *s, float > >> **out, int use_dct) > >> if (use_dct) > >> skip_bits(gb, 2); > >> > >> - for (ch = 0; ch < s->channels; ch++) { > >> - FFTSample *coeffs = out[ch]; > >> + for (ch = 0; ch < channels; ch++) { > >> + FFTSample *coeffs = out[ch + ch_offset]; > >> > >> if (s->version_b) { > >> if (get_bits_left(gb) < 64) > >> @@ -252,17 +255,17 @@ static int decode_block(BinkAudioContext *s, float > >> **out, int use_dct) > >> s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs); > >> } > >> > >> - for (ch = 0; ch < s->channels; ch++) { > >> + for (ch = 0; ch < channels; ch++) { > >> int j; > >> - int count = s->overlap_len * s->channels; > >> + int count = s->overlap_len * channels; > >> if (!s->first) { > >> j = ch; > >> - for (i = 0; i < s->overlap_len; i++, j += s->channels) > >> - out[ch][i] = (s->previous[ch][i] * (count - j) + > >> - out[ch][i] * j) / count; > >> + for (i = 0; i < s->overlap_len; i++, j += channels) > >> + out[ch + ch_offset][i] = (s->previous[ch + ch_offset][i] > >> * (count - j) + > >> + out[ch + ch_offset][i] * > >> j) / count;
^^^ This line needs to be indented some more, to match the previous line.
> >> }
> >> - memcpy(s->previous[ch], &out[ch][s->frame_len - s->overlap_len],
> >> - s->overlap_len * sizeof(*s->previous[ch]));
> >> + memcpy(s->previous[ch + ch_offset], &out[ch +
> >> ch_offset][s->frame_len - s->overlap_len],
> >> + s->overlap_len * sizeof(*s->previous[ch + ch_offset]));
> >> }
> >>
> >> s->first = 0;
> >> @@ -293,6 +296,7 @@ static int binkaudio_receive_frame(AVCodecContext
> >> *avctx, AVFrame *frame)
> >> GetBitContext *gb = &s->gb;
> >> int ret;
> >>
> >> +again:
> >> if (!s->pkt->data) {
> >> ret = ff_decode_get_packet(avctx, s->pkt);
> >> if (ret < 0)
> >> @@ -313,22 +317,31 @@ static int binkaudio_receive_frame(AVCodecContext
> >> *avctx, AVFrame *frame)
> >> }
> >>
> >> /* get output buffer */
> >> - frame->nb_samples = s->frame_len;
> >> - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
> >> - return ret;
> >> + if (s->ch_offset == 0) {
> >> + frame->nb_samples = s->frame_len;
> >> + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
> >> + return ret;
> >> + }
> >>
> >> if (decode_block(s, (float **)frame->extended_data,
> >> - avctx->codec->id == AV_CODEC_ID_BINKAUDIO_DCT)) {
> >> + avctx->codec->id == AV_CODEC_ID_BINKAUDIO_DCT,
> >> + FFMIN(MAX_CHANNELS, s->channels), s->ch_offset)) {
> >> av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n");
> >> return AVERROR_INVALIDDATA;
> >> }
> >> + s->ch_offset += MAX_CHANNELS;
> >> get_bits_align32(gb);
> >> if (!get_bits_left(gb)) {
> >> memset(gb, 0, sizeof(*gb));
> >> av_packet_unref(s->pkt);
> >> }
> >> + if (s->ch_offset >= s->channels) {
> >> + s->ch_offset = 0;
> >> + } else {
> >> + goto again;
> >> + }
> >
> > Is it really intended that the data for one multi-channel frame is
> > divided into several input packets?
>
> You are missing big picture here, >2 files have channels in different
> packets interleaved.
> Something like in XMA. (And nothing signals how are they interleaved.
> so its worse than in XMA) So it is working fine. I just need another
> look for possible regressions and security implications. Renaming
> MAX_CHANNELS is not useful as that is not property of both codecs.
MAX_CHANNELS (2) *is* a property of both codecs, and should be left alone.
I would prefer the '6' magic number be put into a descriptive macro.
LGTM.
-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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