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SubjectRe: [PATCH 4/5] media: meson: vdec: add VP9 input support
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On 05/12/2019 19:40, Nicolas Dufresne wrote:
> Le jeudi 05 décembre 2019 à 10:26 +0100, Neil Armstrong a écrit :
>> From: Maxime Jourdan <mjourdan@baylibre.com>
>>
>> Amlogic VP9 decoder requires an additional 16-byte payload before every
>> frame header.
>
> When I first saw this patch, I assumed data_offset was to be used (like
> for venus), but I think what I'm reading is that the bitstream is
> bounce into another buffer (ring buffer ?) and for this reason such an
> offset is not needed. Maybe worth referring to how the header is being
> added (e.g. while copying the data) ?

The source buffer is updates in-situ, then given to the Parser, copied into
the parser ring buffer, then parses and copies the slice into the decoder "workspace".

I'll specify it the commit log.

Neil

>
>>
>> Signed-off-by: Maxime Jourdan <mjourdan@baylibre.com>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>> ---
>> drivers/staging/media/meson/vdec/esparser.c | 142 +++++++++++++++++++-
>> 1 file changed, 138 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/staging/media/meson/vdec/esparser.c b/drivers/staging/media/meson/vdec/esparser.c
>> index adc5c1e81a4c..aeb68f6c732a 100644
>> --- a/drivers/staging/media/meson/vdec/esparser.c
>> +++ b/drivers/staging/media/meson/vdec/esparser.c
>> @@ -52,6 +52,7 @@
>> #define PARSER_VIDEO_HOLE 0x90
>>
>> #define SEARCH_PATTERN_LEN 512
>> +#define VP9_HEADER_SIZE 16
>>
>> static DECLARE_WAIT_QUEUE_HEAD(wq);
>> static int search_done;
>> @@ -74,14 +75,121 @@ static irqreturn_t esparser_isr(int irq, void *dev)
>> return IRQ_HANDLED;
>> }
>>
>> +/**
>> + * VP9 frame headers need to be appended by a 16-byte long
>
> nit: Maybe the use of "appending" is not appropriate as the header is
> documented in the commit as being "before every frame header" ?
>
>> + * Amlogic custom header
>> + */
>> +static int vp9_update_header(struct amvdec_core *core, struct vb2_buffer *buf)
>> +{
>> + u8 *dp;
>> + u8 marker;
>> + int dsize;
>> + int num_frames, cur_frame;
>> + int cur_mag, mag, mag_ptr;
>> + int frame_size[8], tot_frame_size[8];
>> + int total_datasize = 0;
>> + int new_frame_size;
>> + unsigned char *old_header = NULL;
>> +
>> + dp = (uint8_t *)vb2_plane_vaddr(buf, 0);
>> + dsize = vb2_get_plane_payload(buf, 0);
>> +
>> + if (dsize == vb2_plane_size(buf, 0)) {
>> + dev_warn(core->dev, "%s: unable to update header\n", __func__);
>> + return 0;
>> + }
>> +
>> + marker = dp[dsize - 1];
>> + if ((marker & 0xe0) == 0xc0) {
>> + num_frames = (marker & 0x7) + 1;
>> + mag = ((marker >> 3) & 0x3) + 1;
>> + mag_ptr = dsize - mag * num_frames - 2;
>> + if (dp[mag_ptr] != marker)
>> + return 0;
>> +
>> + mag_ptr++;
>> + for (cur_frame = 0; cur_frame < num_frames; cur_frame++) {
>> + frame_size[cur_frame] = 0;
>> + for (cur_mag = 0; cur_mag < mag; cur_mag++) {
>> + frame_size[cur_frame] |=
>> + (dp[mag_ptr] << (cur_mag * 8));
>> + mag_ptr++;
>> + }
>> + if (cur_frame == 0)
>> + tot_frame_size[cur_frame] =
>> + frame_size[cur_frame];
>> + else
>> + tot_frame_size[cur_frame] =
>> + tot_frame_size[cur_frame - 1] +
>> + frame_size[cur_frame];
>> + total_datasize += frame_size[cur_frame];
>> + }
>> + } else {
>> + num_frames = 1;
>> + frame_size[0] = dsize;
>> + tot_frame_size[0] = dsize;
>> + total_datasize = dsize;
>> + }
>> +
>> + new_frame_size = total_datasize + num_frames * VP9_HEADER_SIZE;
>> +
>> + if (new_frame_size >= vb2_plane_size(buf, 0)) {
>> + dev_warn(core->dev, "%s: unable to update header\n", __func__);
>> + return 0;
>> + }
>> +
>> + for (cur_frame = num_frames - 1; cur_frame >= 0; cur_frame--) {
>> + int framesize = frame_size[cur_frame];
>> + int framesize_header = framesize + 4;
>> + int oldframeoff = tot_frame_size[cur_frame] - framesize;
>> + int outheaderoff = oldframeoff + cur_frame * VP9_HEADER_SIZE;
>> + u8 *fdata = dp + outheaderoff;
>> + u8 *old_framedata = dp + oldframeoff;
>> +
>> + memmove(fdata + VP9_HEADER_SIZE, old_framedata, framesize);
>> +
>> + fdata[0] = (framesize_header >> 24) & 0xff;
>> + fdata[1] = (framesize_header >> 16) & 0xff;
>> + fdata[2] = (framesize_header >> 8) & 0xff;
>> + fdata[3] = (framesize_header >> 0) & 0xff;
>> + fdata[4] = ((framesize_header >> 24) & 0xff) ^ 0xff;
>> + fdata[5] = ((framesize_header >> 16) & 0xff) ^ 0xff;
>> + fdata[6] = ((framesize_header >> 8) & 0xff) ^ 0xff;
>> + fdata[7] = ((framesize_header >> 0) & 0xff) ^ 0xff;
>> + fdata[8] = 0;
>> + fdata[9] = 0;
>> + fdata[10] = 0;
>> + fdata[11] = 1;
>> + fdata[12] = 'A';
>> + fdata[13] = 'M';
>> + fdata[14] = 'L';
>> + fdata[15] = 'V';
>> +
>> + if (!old_header) {
>> + /* nothing */
>> + } else if (old_header > fdata + 16 + framesize) {
>> + dev_dbg(core->dev, "%s: data has gaps, setting to 0\n",
>> + __func__);
>> + memset(fdata + 16 + framesize, 0,
>> + (old_header - fdata + 16 + framesize));
>> + } else if (old_header < fdata + 16 + framesize) {
>> + dev_err(core->dev, "%s: data overwritten\n", __func__);
>> + }
>> + old_header = fdata;
>> + }
>> +
>> + return new_frame_size;
>> +}
>> +
>> /* Pad the packet to at least 4KiB bytes otherwise the VDEC unit won't trigger
>> * ISRs.
>> * Also append a start code 000001ff at the end to trigger
>> * the ESPARSER interrupt.
>> */
>> -static u32 esparser_pad_start_code(struct amvdec_core *core, struct vb2_buffer *vb)
>> +static u32 esparser_pad_start_code(struct amvdec_core *core,
>> + struct vb2_buffer *vb,
>> + u32 payload_size)
>> {
>> - u32 payload_size = vb2_get_plane_payload(vb, 0);
>> u32 pad_size = 0;
>> u8 *vaddr = vb2_plane_vaddr(vb, 0);
>>
>> @@ -186,13 +294,27 @@ esparser_queue(struct amvdec_session *sess, struct vb2_v4l2_buffer *vbuf)
>> int ret;
>> struct vb2_buffer *vb = &vbuf->vb2_buf;
>> struct amvdec_core *core = sess->core;
>> + struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
>> u32 payload_size = vb2_get_plane_payload(vb, 0);
>> dma_addr_t phy = vb2_dma_contig_plane_dma_addr(vb, 0);
>> + u32 num_dst_bufs = 0;
>> u32 offset;
>> u32 pad_size;
>>
>> - if (esparser_vififo_get_free_space(sess) < payload_size)
>> + if (sess->fmt_out->pixfmt == V4L2_PIX_FMT_VP9) {
>> + if (codec_ops->num_pending_bufs)
>> + num_dst_bufs = codec_ops->num_pending_bufs(sess);
>> +
>> + num_dst_bufs += v4l2_m2m_num_dst_bufs_ready(sess->m2m_ctx);
>> + if (sess->fmt_out->pixfmt == V4L2_PIX_FMT_VP9)
>> + num_dst_bufs -= 2;
>> +
>> + if (esparser_vififo_get_free_space(sess) < payload_size ||
>> + atomic_read(&sess->esparser_queued_bufs) >= num_dst_bufs)
>> + return -EAGAIN;
>> + } else if (esparser_vififo_get_free_space(sess) < payload_size) {
>> return -EAGAIN;
>> + }
>>
>> v4l2_m2m_src_buf_remove_by_buf(sess->m2m_ctx, vbuf);
>>
>> @@ -206,7 +328,19 @@ esparser_queue(struct amvdec_session *sess, struct vb2_v4l2_buffer *vbuf)
>> vbuf->field = V4L2_FIELD_NONE;
>> vbuf->sequence = sess->sequence_out++;
>>
>> - pad_size = esparser_pad_start_code(core, vb);
>> + if (sess->fmt_out->pixfmt == V4L2_PIX_FMT_VP9) {
>> + payload_size = vp9_update_header(core, vb);
>> +
>> + /* If unable to alter buffer to add headers */
>> + if (payload_size == 0) {
>> + amvdec_remove_ts(sess, vb->timestamp);
>> + v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
>> +
>> + return 0;
>> + }
>> + }
>> +
>> + pad_size = esparser_pad_start_code(core, vb, payload_size);
>> ret = esparser_write_data(core, phy, payload_size + pad_size);
>>
>> if (ret <= 0) {


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